Final answer:
Abraham Lincoln was indeed the first Republican president of the United States when he was elected in 1860. The Republican Party was founded on the platform of anti-slavery and during Lincoln's reelection, it was temporarily renamed the National Union Party.
Step-by-step explanation:
True or False: Abraham Lincoln was the first Republican president of the United States. This statement is true. The Republican party, established in the 1850s, was characterized by its opposition to the expansion of slavery into the western territories.
Abraham Lincoln, who became the Republican candidate after a series of political successes and during a time when the Democrats were fragmented, was the party's first successful presidential candidate. He was indeed the first Republican to be elected as President of the United States in the election of 1860.
Lincoln's platform and the Republican Party's agenda were largely based on the abolition of slavery and the promotion of economic modernization. In 1864, the Republican Party changed its name to the National Union Party as a strategic move to attract War Democrats and reunite the nation.
This led to the reelection of Abraham Lincoln, with Andrew Johnson as his vice president, signaling a political victory for their policy of abolition as a precursor to peace and the eventual end of the Civil War.