Today in 1521, Hernán Cortés and his army.conquered Tenochtitalan.

On this day in 1521, the Aztec capital Tenochtitalan fell to Hernán Cortés and his Spanish/Indian army.

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Wikipedia:

Fall of Tenochtitlan

Battle of Pharsalus happened today 2061 years ago ...

Julius Caesar decisively defeated Pompey the Great at the Battle of Pharsalus in central Greece on August 9, 48 BC.

 Battle of Pharsalus

Today in 1929 the Graf Zeppelin left Lakehurst, New Jersey ...

On this day in 1929 the Graf Zeppelin left Lakehurst, New Jersey, on the first round-the-world trip by an airship ..

CRUISE AND AIRSHIP HISTORY

THE GRAF ZEPPLIN IN RIO DE JANEIRO - 1930

Today in 1945 Truman signed the U.N. Charter.

On this day in 1945, the United States joined the new United Nations when President Truman signed the U.N. Charter.
National Archives: Our Presidents

United Nations Charter

The Signing of the U.N. Charter (Youtube)

U.N. Charter

Today in 1945, the Enola Gay dropped an atomic bomb on Hiroshima

At 8:16 a.m. (local time) on August 6 1945, a B-29 bomber, the Enola Gay dropped an atomic bomb on Hiroshima, Japan.

Wikipedia: Atomic bombings of Hiroshima and Nagasaki

Hiroshima Nuclear (atomic) Bomb - USA attack on Japan (1945)

152 years ago, the widely loathed federal income tax was born

Aug. 5, 1861: Needing cash to finance the Civil War, President Abraham Lincoln signed the Revenue Act — imposing the first federal income tax. Lincoln and Congress agreed that all incomes over $800 would be taxed at a 3 percent rate. Lincoln knew that taxes would be unpopular. But he recognized that America needed to pay for its wars.

Politico - Aug. 5, 1861

August 2, 1930. Einstein wrote to FDR warning him about Germany and the atomic bomb

On August 2, 1039, Einstein signed a letter to FDR warning him of the possibility of Germany developing an atomic bomb. RIGHT: Roosevelt's letter of response.


Wikipedia:

Einstein–Szilárd letter