The presidency of Abraham Lincoln began on March 4, 1861, when he was inaugurated as the 16th President of the United States, and ended upon his assassination and death on April 15, 1865, 42 days into his second term. Lincoln was the first member of the recently-established Republican Party elected to the presidency. In 1865, Lincoln was instrumental in the passage of the Thirteenth Amendment, which made slavery unconstitutional. Lincoln also presided over the passage of important domestic legislation, including the first of the Homestead Acts, the Morrill Land-Grant Act of 1862, and the Pacific Railroad Act of 1862. He ran for re-election in 1864 on the National Union ticket, which was supported by War Democrats in addition to Republicans. During the war, the tariff also helped manufacturers off-set the burden of new taxes. The Union victory and the subsequent Supreme Court case of Texas v. White ended debate regarding the constitutionality of secession and Nullification by the states. In addition to ending slavery, the Reconstruction Amendments enshrined Constitutional clauses promoting racial equality.