OTD July 28, 1914, Austria-Hungary declared war on Serbia, igniting World War I.

In 1868, the U.S. ratified the 14th Amendment, granting citizenship to former slaves.

Peru declared independence from Spain in 1821.

In 1945, a U.S. bomber crashed into the Empire State Building, killing 14.

July 28 also marks World Hepatitis Day and Peru’s Independence Day.

Notable birthdays include Beatrix Potter and Jacqueline Kennedy Onassis. The day is rich with political, scientific, and cultural milestones.