Abraham Lincoln was an American lawyer and statesman. He became the 16th president of the U.S in 1861. He was born in Indiana.
Initially, he remained committed to the Whig party but left it in 1856 as it became defunct and joined the newly formed Republican party.
He was the president during the civil war and was assassinated by John Wilkes Booth on April 15, 1865 He was the first president to be assassinated.
He is called the "Great Emancipator" due to his efforts to end slavery in the country.
So, Joined the Republican party is the correct answer.