Was Abraham Lincoln a member of the Republican Party.

With the election of Abraham Lincoln (the first Republican president) in 1860, the Party's success in guiding the Union to victory in the American Civil War, and the Party's role in the abolition of slavery, the Republican Party largely dominated the national political scene until 1932. In 1912, former Republican president Theodore Roosevelt formed the Progressive ("Bull Moose") Party after being rejected by the GOP and ran unsuccessfully as a third-party presidential candidate calling for social reforms.

yes

Explanation:

Abraham Lincoln was the first president elected under the Republican Party.