The **Republican Party**, also known as the **GOP (Grand Old Party)**, is one of the two major political parties in the United States, founded in 1854 primarily by anti-slavery activists opposing the Kansas-Nebraska Act and the expansion of slavery into U.S. territories[1][5]. It was formed from a coalition of former Whigs, Democrats, and Free Soil party members who shared opposition to slavery and a desire for a national political force promoting economic development and social order[2][5]. The party's early base included northern Protestants, businessmen, factory workers, professionals, and prosperous farmers. It strongly supported pro-business policies like the national banking system, the gold standard, railroads, and high tariffs[1][3]. Abraham Lincoln, the first Republican president elected in 1860, led the party through the Civil War, championing the abolition of slavery and the preservation of the Union. This solidified the GOP’s dominance in national politics for decades, especially in the North, while it remained weak in the South[1][5][6]. Historically, the Republican Party was instrumental in major social reforms, including the Emancipation Proclamation and the passage of the 13th, 14th, and 15th Amendments, which abolished slavery, guaranteed equal protection, and secured voting rights for African Americans, respectively[6]. The party also supported women's suffrage early on, backing the 19th Amendment[6]. In the 20th century, Republicans were associated with both conservative economic policies—favoring reduced taxes, limited government regulation, and individual economic freedom—and a strong national defense[7]. The party experienced ideological splits, notably in 1912 when Theodore Roosevelt led a progressive faction away from the conservative wing[1][5]. Today, the GOP continues to promote conservative social policies and states’ rights, opposing extensive federal intervention and advocating free-market principles[7]. For readers interested in business and technology,