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Our on this day in history archives contain over 200,000 events, birthdays and deaths from 6,000 years of history. Here is a roundup of a few more of them:

April 21 is the 111th day of the year (112th in leap years) in the Gregorian calendar; 254 days remain until the end of the year.

EVENTS

753 BC – Romulus founds Rome (traditional date).

1509 – Henry VIII ascends the throne of England on the death of his father, Henry VII.

1789 – John Adams sworn in as first US Vice President (nine days before George Washington).

1789 – George Washington's reception at Trenton is hosted by the Ladies of Trenton as he journeys to New York City for his first inauguration.

1836 – Texas Revolution: The Battle of San Jacinto: Republic of Texas forces under Sam Houston defeat troops under Mexican General Antonio López de Santa Anna.

1898 – Spanish–American War: The United States Navy begins a blockade of Cuban ports. When the U.S. Congress issued a declaration of war on April 25, it declared that a state of war had existed from this date.

1918 – World War I: German fighter ace Manfred von Richthofen, better known as "The Red Baron", is shot down and killed over Vaux-sur-Somme in France.

1934 – The "Surgeon's Photograph", the most famous photo allegedly showing the Loch Ness Monster, is published in the Daily Mail (in 1994, it is revealed to be a hoax).

1946 – The U.S. Weather Bureau publish a paper which stated the width of a tornado which struck the city of Timber Lake, South Dakota was 4 miles (6.4 km), which would make this the widest tornado ever documented in history.

1952 – Secretary's Day (now Administrative Professionals' Day) is first celebrated.

1958 – United Air Lines Flight 736 collides with a United States Air Force fighter jet near Arden, Nevada in what is now Enterprise, Nevada.

1960 – Brasília, Brazil's capital, is officially inaugurated. At 09:30, the Three Powers of the Republic are simultaneously transferred from the old capital, Rio de Janeiro.

1962 – The Seattle World's Fair (Century 21 Exposition) opens. It is the first World's Fair in the United States since World War II.

1965 – The 1964–1965 New York World's Fair opens for its second and final season.

1972 – Astronauts John Young and Charles Duke fly Apollo 16's Apollo Lunar Module to the Moon's surface, the fifth NASA Apollo Program crewed lunar landing.

1977 – Annie opens on Broadway.

1982 – Baseball: Rollie Fingers of the Milwaukee Brewers becomes the first pitcher to record 300 saves.

2014 – The American city of Flint, Michigan switches its water source to the Flint River, beginning the ongoing Flint water crisis which has caused lead poisoning in up to 12,000 people, and at least 12 deaths from Legionnaires' disease, ultimately leading to criminal indictments against 15 people, five of whom have been charged with involuntary manslaughter.

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