
Catholicism has had a long and complex history in the United States, with the religion's presence dating back to the early days of the nation. While Catholics were present in small numbers during the colonial era, particularly in Maryland and former French and Spanish colonies, the religion began to grow in the 19th century due to waves of immigration from predominantly Catholic countries such as Ireland, Germany, Italy, and Poland. By 1850, Catholics had become the largest single denomination in the country, and their influence continued to grow in the following decades. Today, Catholicism is one of the most diverse Christian denominations in the US in terms of race and ethnicity, with a significant impact on the country's politics and culture.
| Characteristics | Values |
|---|---|
| Year Catholics became the largest denomination in the US | 1850 |
| Percentage of US Catholics in 1850 | 7% |
| Number of US Catholics in 1850 | 1.6 million |
| Percentage increase in the number of US Catholics between 1840 and 1850 | 270% |
| Number of Irish Catholics who immigrated to the US between 1815 and 1865 | 1,683,791 |
| Percentage of "young" US Catholics who have left the faith | 41% |
| Percentage of US Catholics who are "Secularists" | 10% |
| Percentage of US priests who faced sexual accusations between 1950 and 2002 | 4% |
| US state with the highest percentage of adults who self-describe as very religious | Mississippi (63%) |
| US state with the lowest percentage of adults who self-describe as very religious | New Hampshire (20%) |
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What You'll Learn

Immigration from Catholic countries in the 19th and 20th centuries
Immigration has always been a significant factor in the United States' religious landscape, with the country witnessing its most substantial waves of immigration from the 1820s onwards. The mid-19th century saw a notable shift in the country's religious makeup, with the arrival of large numbers of German, Irish, and other European Catholics. This period also marked the beginning of anti-Catholic sentiments and intra-faith conflicts, particularly within the American public school system, which had a strong Protestant bias. These tensions would persist and reappear in the late 20th century, mirroring the challenges faced by Muslim immigrants in the 20th and 21st centuries.
During the 1840s, Catholics began to associate with the Democratic Party, favouring them over the conservative Whigs. This political alignment continued into the 20th century, where Catholics formed a crucial part of the New Deal Coalition. In 1928, Al Smith became the first Catholic to gain a major party's nomination for president, though his religion became a contentious issue during the campaign, with many Protestants fearing his potential allegiance to the Church of Rome.
The greatest influx of Catholics to the United States occurred during the mid-to-late 19th and early 20th centuries, with Irish, German, Italian, Portuguese, French Canadian, Polish, and Lebanese (Maronite) immigrants contributing significantly to this growth. Between 1815 and 1865, a substantial number of 1,683,791 Irish Catholics immigrated to the US, with Ireland's population decreasing dramatically throughout the 19th century. From 1848 to 1858, nearly one million Germans arrived, fleeing limited economic opportunities and legal restrictions at home.
The establishment of separate parishes and institutions by bishops for major ethnic groups, including those from Ireland, Germany, Poland, and Italy, was a notable development during this period of intense emigration from the 1840s to 1914. This trend was exemplified by the Archdiocese of Dubuque in Iowa, which catered to the needs of German and Irish immigrants. Italian Jesuit expatriates also played a significant role, establishing numerous institutions to serve the diverse population in the western regions of the country.
While small communities of Catholics had existed in the United States since the Colonial period, particularly in former French and Spanish colonies and in Maryland, the immigration waves of the 19th and early 20th centuries transformed the religious landscape. By 1850, Catholics had become the largest single denomination in the country, with their population tripling to seven million between 1860 and 1890. This growth was influenced by a Catholic Revival, or "Ultramontanism," that swept across Europe and the Americas in the early 19th century, fostering a sense of moral superiority among adherents.
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Catholicism in the US South and Midwest
Catholicism in the United States has historically been associated with left-wing politics and the Democratic Party. While there were a few early Catholic settlers from Northwestern Europe in the colonies, they were a minority compared to the Protestant majority. The vast majority of Catholics in the US today are descendants of immigrants from predominantly Catholic countries during the mid-to-late 19th and 20th centuries.
Catholicism in the US South
The US South has experienced a Catholic population boom in recent decades. Several dioceses in the South, centred on growing cities, have gained hundreds of thousands of Catholics. The Archdiocese of Atlanta gained 939,000 Catholics in two decades, while Fort Worth, Texas gained 871,000, and Galveston-Houston gained 749,000. The South as a region has a Catholic population of 32%, which has increased in recent years due to growing numbers in Texas, Louisiana, and Florida. The rest of the Southern states remain overwhelmingly Protestant.
Catholicism was introduced to the Southern territories that were once under Spanish and French influence, such as Texas, Arkansas, Oklahoma, and Florida. In the late 17th century, French expeditions established missions and small settlements along the Mississippi River and Gulf Coast, including in Michigan, Illinois, Louisiana, and as far north as the Illinois Country. These territories were under the authority of the diocese of Quebec, funded by the French king. However, the religious fervour of the population was weak, and Catholics often ignored the tithe, a 10% tax to support the clergy.
Catholicism in the US Midwest
The US Midwest has traditionally been a stronghold of Catholicism, with cities like Chicago, Detroit, and St. Louis experiencing significant immigration from Catholic populations in the 19th and early 20th centuries. However, in recent decades, the Midwest has seen a decline in its Catholic population. In 1980, nearly 70% of the nation's Catholics lived in the Northeast or Midwest, but by 2019, that percentage had dropped to 47%. Dioceses in the Midwest, such as Chicago and Detroit, have had to undergo parish mergers due to the shrinking Catholic population.
The Diocese of Bismarck, North Dakota, with only 60,000 Catholics, has had more priestly ordinations in recent years than larger dioceses in the South and West. This indicates that smaller dioceses in the Midwest may still foster more vocations to the priesthood, despite the overall decline in Catholic population in the region.
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The Catholic Church's diversity and inclusivity
Catholicism has had a significant political impact on the United States, and the religion has historically been associated with left-wing politics and the Democratic Party. The number of US Catholics has increased by 3 to 6% each decade since 1965, and the Catholic Church is the most diverse in terms of race and ethnicity in the US. Hispanics account for 38% of Catholics, while blacks and Asians make up 3% each. The Catholic Church in the US represents a highly diverse organization, welcoming newcomers with a more inclusive attitude. This is reflected in the aspirations of 19th-century church leaders like Archbishops John Ireland and James Gibbons, who aimed to integrate Catholic immigrants into American society.
The Catholic Church, with its global presence, embraces people of all nationalities, ethnicities, races, and cultures. This inherent inclusivity is exemplified by the parable of the good Samaritan, Jesus' treatment of women, and St. Paul's assertion that Greeks and Gentiles are worthy of faith and salvation. These teachings form the basis of Catholic social doctrine, emphasizing the inherent dignity of every individual, regardless of their differentiating characteristics.
However, the Catholic Church has also faced criticism and allegations of exclusivity and racism, particularly in the wake of the Black Lives Matter movement and calls for LGBTQ+ inclusion. In response to the former, many Black alumni from Catholic and Jesuit high schools expressed disappointment about their experiences, indicating a lack of belonging during their student years. This prompted reflections on the role of school leaders in fostering an inclusive environment and addressing systemic racism.
Additionally, the Church's stance on LGBTQ+ rights has been a subject of internal and external debate. While some argue for the recognition of same-sex marriages and the inclusion of LGBTQ+ individuals, others within the Church fear the spread of Western gender values and the potential challenge to the authority of God on Earth. This tension highlights the diverse perspectives within the Catholic Church and the ongoing dialogue surrounding inclusion and diversity.
In conclusion, the Catholic Church in the United States has a complex history of diversity and inclusivity. While it has been successful in attracting a diverse range of followers and promoting inclusion, it has also faced challenges and criticisms, particularly regarding race and LGBTQ+ rights. These issues continue to shape the Church's dialogue and efforts toward creating a more inclusive community.
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Catholics' political leanings and voting behaviour
Catholicism has had a significant political impact on the United States. The religion has historically been associated with left-wing politics and the Democratic Party. In the 1840s, Catholics began to identify with the Democrats against the conservative and evangelical-influenced Whigs. This continued into the 20th century, where Catholics formed a core part of the New Deal Coalition.
However, in the 1960s and 1970s, a number of Catholics abandoned their traditional affiliation with the Democratic Party and began to support the Republican Party. This shift is evidenced by the fact that Nixon received 33% of the Catholic vote in the 1968 election compared to 52% in 1972. As a group, Catholics represented a quarter of the nation's electorate and were now one of the nation's largest swing groups.
In recent years, the Republican Party has gained modest advantages among Catholics. According to Pew Research Center polls in 2018 and 2019, about half of Catholic registered voters (48%) described themselves as Republicans or leaned toward the Republican Party, while roughly the same share (47%) identified with or leaned toward the Democratic Party. In the 2016 presidential election, 52% of Catholics backed Republican Donald Trump while 44% voted for Democrat Hillary Clinton.
There are significant differences in political leanings among different racial groups within the Catholic Church in the United States. The Catholic Church in the US is the most diverse in terms of race and ethnicity, with Hispanics accounting for 38% of Catholics and Blacks and Asians at 3% each. White Catholic registered voters are more likely to identify with or lean toward the Republican Party (57%), while most Hispanic Catholic voters (68%) identify as Democrats or lean Democratic.
When it comes to specific policy issues, Catholics are often more aligned with their political party than with the teachings of their church. For example, on the issue of abortion, 77% of Democratic and Democratic-leaning Catholic adults say they think abortion should be legal in all or most cases, while 63% of Republican and Republican-leaning Catholics say abortion should be illegal in all or most cases.
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Catholicism in the media
Catholicism in the United States has a long and complex history, with the religion playing a significant role in the country's cultural and political landscape. The United States is home to the largest Christian and Protestant population in the world, and while Evangelicals and Mainline Protestants make up a large portion of this demographic, Catholics also constitute a significant percentage.
The presence of Catholicism in the US can be traced back to the early days of colonization, with the establishment of missions and colonies in French territories such as Michigan, Illinois, and Louisiana. Maryland, one of the English colonies, also had a sizable Catholic population, although it became predominantly Protestant by 1670. The waves of immigration from the 1840s to 1914 significantly contributed to the growth of Catholicism in the US, with German, Irish, Italian, Polish, and French-Canadian immigrants making up a large number of new Catholics. By 1850, Catholics had become the country's largest single denomination, and their population continued to grow, tripling to seven million between 1860 and 1890.
Catholicism in the US has had its share of controversies, with historical tensions between Catholics and Protestants, and more recently, widespread media coverage of sexual abuse allegations against priests. The sexual abuse crisis has had a significant financial impact on dioceses and archdioceses, with some, like the Baltimore Archdiocese, filing for bankruptcy reorganization.
In recent times, there has been a decline in religious affiliation and participation in the US, which has also affected Catholic media outlets. Diocesan newspapers, which traditionally served as the voice of the bishop, have faced challenges due to changing dynamics and competition from new Catholic media. However, a recent study by the Center for Applied Research in the Apostolate (CARA) showed a rise in the percentage of Catholics who read their diocesan papers, either in print or online, between 2005 and 2023.
The portrayal of Catholics in mainstream media is a topic of discussion among practitioners of the religion. Some Catholics express a desire for more positive representation, while others acknowledge the importance of flawed and realistic characters. Catholic imagery and rituals are often featured in visual media, and the religion's impact on politics has also been noted, with historical associations to the Democratic Party and left-wing politics.
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Frequently asked questions
Catholics became the largest single denomination in the US by 1850, comprising 7% of the total population.
The growth of Catholicism in the US was primarily driven by waves of immigration from predominantly Catholic countries and regions during the 19th and 20th centuries. Countries such as Ireland, Germany, Italy, and Poland contributed significantly to the increasing Catholic population in the US.
The growing Catholic population in the US had political implications, with Catholics associating themselves with the Democratic Party during the 19th and early 20th centuries. Al Smith, a Catholic, became the first Catholic to gain a major party's nomination for president in 1928, though his religion became a contentious issue during the campaign.
While Catholicism is one of the major Christian denominations in the US, it does not constitute a majority. As of 2012, Protestants no longer formed a majority in the US, with a diverse range of religious groups making up the country's religious landscape.











































