The Republican Party was founded in 1854 by anti-slavery activists who opposed the Kansas–Nebraska Act, which allowed for the potential extension of slavery to the western territories.[20] The party supported economic reform geared to industry, supporting investments in manufacturing, railroads, and banking. The party was successful in the North, and by 1858, it had enlisted most former Whigs and former Free Soilers to form majorities in almost every northern state. White Southerners of the planter class became alarmed at the threat to the future of slavery in the United States. With the 1860 election of Abraham Lincoln, the first Republican president, the Southern states seceded from the United States. Under the leadership of Lincoln and a Republican Congress, the Republican Party led the fight to defeat the Confederate States in the American Civil War, thereby preserving the Union and abolishing slavery.
Lewis, Andrew R. (August 28, 2019). "The Inclusion-Moderation Thesis: The U.S. Republican Party and the Christian Right". Oxford Research Encyclopedia of Politics. Oxford University Press. doi:10.1093/acrefore/9780190228637.013.665. ISBN978-0-19-022863-7. Considering all the evidence, the most apt description is that conservative Christianity has transformed the Republican Party, and the Republican Party has transformed conservative Christianity ... With its inclusion in the Republican Party, the Christian right has moderated on some aspects ... At the same time, the Christian right has altered Republican politics.
Trollinger, William (October 8, 2019). "Fundamentalism turns 100, a landmark for the Christian Right". The Conversation. ISSN2201-5639. Archived from the original on May 7, 2022. Retrieved July 3, 2022. The emergent Christian Right attached itself to the Republican Party, which was more aligned with its members' central commitments than the Democrats ... By the time Falwell died, in 2007, the Christian Right had become the most important constituency in the Republican Party. It played a crucial role in electing Donald Trump in 2016.
Thomson-DeVeaux, Amelia (October 27, 2022). "How Much Power Do Christians Really Have?". FiveThirtyEight. Archived from the original on April 10, 2024. Retrieved June 16, 2024. In the 1980s and 1990s, as white Christian conservatives forged an alliance with the Republican Party, Christianity itself started to become a partisan symbol. Identifying as a Christian was no longer just about theology, community or family history — to many Americans, the label became uncomfortably tangled with the Christian Right's political agenda, which was itself becoming increasingly hard to separate from the GOP's political agenda.
^Wilbur, Miller (2012). "Libertarianism". The Social History of Crime and Punishment in America. Vol. 3. Thousand Oaks, California: SAGE Publications. pp. 1006–1007. ISBN978-1-4129-8876-6. While right-libertarianism has been equated with libertarianism in general in the United States, left-libertarianism has become a more predominant aspect of politics in western European democracies over the past three decades. ... Since the 1950s, libertarianism in the United States has been associated almost exclusively with right-libertarianism ... As such, right-libertarianism in the United States remains a fruitful discourse with which to articulate conservative claims, even as it lacks political efficacy as a separate ideology. However, even without its own movement, libertarian sensibility informs numerous social movements in the United States, including the U.S. patriot movement, the gun-rights movement, and the incipient Tea Party movement.
Greenberg, David (January 27, 2021). "An Intellectual History of Trumpism". Politico Magazine. Archived from the original on April 11, 2024. Retrieved June 13, 2024. The larger ideology that the president-elect represents is a post-Iraq War, post-crash, post-Barack Obama update of what used to be called paleoconservatism: On race and immigration, where the alt-right affinities are most pronounced, its populist ideas are carrying an already right-wing party even further right.
Wineinger, Catherine; Nugent, Mary K. (January 2, 2020). "Framing Identity Politics: Right-Wing Women as Strategic Party Actors in the UK and US". Journal of Women, Politics & Policy. 41 (1): 5. doi:10.1080/1554477X.2020.1698214. ISSN1554-477X.
Jessosula, Matteo; Natili, Marcello; Pavolini, Emmanuele (August 8, 2022). "'Exclusionary welfarism': a new programmatic agenda for populist right-wing parties?". Contemporary Politics. 28 (4): 447–449. doi:10.1080/13569775.2021.2011644. ISSN1356-9775.
Winberg, Oscar (2017). "Insult Politics: Donald Trump, Right-Wing Populism, and Incendiary Language". European Journal of American Studies. 12 (2): 1–16. doi:10.4000/ejas.12132. ISSN1991-9336. Archived from the original on December 31, 2024. Retrieved February 2, 2025. pp. 5–6: With the presidency of George W. Bush, coinciding with the ascendance of the conservative media establishment and ending with the mass protests of the Tea Party, the long tradition of right-wing populism was a firmly institutionalized part of the conservative movement and, by extension, the Republican Party. Trump's rise should be understood as part of the long tradition of right-wing populism and the ultimate triumph of the Tea Party movement; a right-wing populist eruption within the Republican Party fueled by both a conservative media establishment and anti-intellectual and, at times, overtly racial appeals.
Fiorino, Daniel J. (2022). "Climate change and right-wing populism in the United States". Environmental Politics. 31 (5): 801–819. Bibcode:2022EnvPo..31..801F. doi:10.1080/09644016.2021.2018854. ISSN0964-4016. Archived from the original on June 12, 2024. Retrieved February 2, 2025. In recent years, the Republican Party in the United States has taken on the characteristics of right-wing populism, especially under President Donald Trump. Like most right-wing populist parties, the party under Trump is hostile to climate mitigation. This is reflected in skepticism or rejection of climate science, opposition to multilateral institutions and agreements, aggressive domestic exploitation of fossil fuels, and depiction of climate advocates and experts as 'elites' set on undermining the will of 'the people'.
Cliffe, Jeremy (February 15, 2023). "The strange death of the centre right". The New Statesman. Archived from the original on February 11, 2025. Retrieved February 5, 2025. In Western democracies conventional conservatism is foundering. How did this once-dominant political force become so diminished?
^Sanger, David E. (February 1, 2025). "To Trump, Tariffs Are Not a Means but an End". The New York Times. Archived from the original on February 2, 2025. Retrieved February 1, 2025. Many presidents use tariffs to force negotiations. But for President Trump, they are the point, a source of revenue as he pursues a Gilded Age vision.
^Haberman, Maggie; Goldmacher, Shane; Swan, Jonathan (July 8, 2024). "Trump Presses G.O.P. for New Platform That Softens Stance on Abortion". The New York Times. Archived from the original on July 18, 2024. Retrieved July 9, 2024. The platform is even more nationalistic, more protectionist and less socially conservative than the 2016 Republican platform that was duplicated in the 2020 election.