The 19th Amendment gave women the right to vote nationally on August 18, 1920; so why is Women’s Equality Day on August 26th each year? The simple answer is that even when a constitutional amendment has been ratified it’s not official until it has been certified by the correct government official. In 1920, that official was U.S. Secretary of State Bainbridge Colby. On August 26, 1920, Colby signed a proclamation behind closed doors at 8 a.m., ending a struggle for the vote that started a century earlier.

In 1971, Representative Bella Abzug championed a bill in the U.S. Congress to designate August 26 as “Women’s Equality Day.” The bill says that “the President is authorized and requested to issue a proclamation annually in commemoration of that day in 1920, on which the women of America were first given the right to vote.”