On June 15, 1215, King John sealed the Magna Carta at Runnymede, establishing certain fundamental rights as part of the law in England. Learn more about the Magna Carta.

On June 15, 1804, the Twelfth Amendment to the U.S. Constitution was ratified, creating separate votes in the electoral college for President and Vice-President. In prior elections, the country experienced problems with the original system in Article II, Section 1, Clause 3 of the Constitution, which failed to adequately segregate votes for President and Vice-President. This led to a tie in the 1800 election between Presidential and Vice-Presidential candidates of the same party. Learn more about the history of the Twelfth Amendment from the University of Chicago.