The 1904 United States presidential election was the 30th quadrennial presidential election, held on Tuesday, November 8, 1904. Incumbent Republican President Theodore Roosevelt defeated the conservative Democratic nominee, Alton B. Parker. Roosevelt's victory made him the first president who ascended to the presidency upon the death of his predecessor to win a full term in his own right. This was also the second presidential election in which both major party candidates were registered in the same home state; the others have been in 1860, 1920, 1940, 1944, and 2016.

The 1860 United States presidential election was the 19th quadrennial presidential election, held on Tuesday, November 6, 1860. In a four-way contest, the Republican Party ticket of Abraham Lincoln and Hannibal Hamlin won a national popular plurality, a popular majority in the North where states already had abolished slavery, and a national electoral majority comprising only Northern electoral votes. Lincoln's election thus served as the main catalyst of the states that would become the Confederacy seceding from the Union. This marked the first time that a Republican was elected president. It was also the first presidential election in which both major party candidates were registered in the same home state; the others have been in 1904, 1920, 1940, 1944, and 2016.