The Republican Party was founded in the 1850s by anti-slavery activists and modernizers
who opposed the expansion of slavery into western territories. It quickly grew into a
major political force, and in 1860, Abraham Lincoln became the first Republican elected
President.
During the Civil War and Reconstruction, Republicans championed the preservation of the
Union, the abolition of slavery, and constitutional amendments securing civil rights for
formerly enslaved people. Through the late 19th century, the party aligned with business
interests, industrial growth, and economic modernization.
In the 20th century, Republicans often emphasized limited government, lower taxes,
and strong national defense. The party’s modern conservative movement gained momentum
in the mid‑20th century, culminating in the election of Ronald Reagan in 1980, whose
administration reshaped Republican priorities around deregulation, free‑market policies,
and a more assertive foreign policy.