What was the closest presidential election?
Just so, has any president ever won all 50 states?
A president has won every state three times: in 1788 and 1792, George Washington won all the electoral votes running effectively unopposed, and in 1820, James Monroe, running unopposed, carried all twenty-three states in the union at that time (although one electoral vote was cast for John Quincy Adams and two electors
Beside above, has anyone ever won an election by 1 vote?
According to a 2001 study of state and federal elections in the United States between 1898 and 1992, "one of every 100,000 votes cast in U.S. elections, and one of every 15,000 votes cast in state elections, "mattered" in the sense that they were cast for a candidate that officially tied or won by one vote."
The original system for electing presidents provided that the candidate receiving a majority of Electoral College votes would become president, while the runner-up would become vice president. The 1800 election resulted in a tie between Thomas Jefferson and Aaron Burr.