1648: The Treaty of Westphalia is signed, ending the Thirty Years' War.
1787: The Constitutional Convention meets in Philadelphia to draft the United States Constitution.
1813: The Battle of Las Cruces is fought between American and British forces in present-day New Mexico, resulting in an American victory.
1868: The Decoration Day holiday is first observed in the United States, to honor soldiers who died in the Civil War.
1913: The first Indianapolis 500 auto race is held.
1942: The Battle of Midway begins, a turning point in the Pacific theater of World War II.
1961: The first Alan Shepard becomes the first American to travel into space.
1967: The Nigerian Civil War begins.
1971: The Mariner 9 spacecraft is launched, becoming the first spacecraft to orbit Mars.
1975: The European Space Agency (ESA) is established.
1982: Israel invades Lebanon, beginning the Lebanon War.
1998: The Good Friday Agreement is signed, bringing an end to the conflict in Northern Ireland.
2003: The World Health Organization (WHO) issues a global alert about the outbreak of SARS.
2011: The United States military kills Osama bin Laden in a raid in Pakistan.
2017: Emmanuel Macron wins the French presidential election, becoming the youngest president of France since Napoleon Bonaparte.