306 - Constantine I proclaimed Roman emperor by his troops.
1261 - Constantinople is captured by Nicaean forces under the command of Michael VIII Palaeologus, allowing the re-creation of the Byzantine Empire.
1593 - Henry IV of France publicly converts from Protestantism to Roman Catholicism.
1722 - Three Years War begins along Maine and Massachusetts border.
1758 - French and Indian War: The island battery at Fortress Louisbourg is silenced and all French warships are destroyed or taken. *1759 - French and Indian War: In Canada, British forces capture Fort Niagara from French, who subsequently abandon Fort Rouillé.
1799 - At Aboukir in Egypt, Napoleon I of France defeats 10,000 Ottomans under Mustafa Pasha.
1814 - War of 1812: Battle of Lundy's Lane - Reinforcements arrive near Niagara for General Riall's British and Canadian force, and bloody, all-night battle with Jacob Brown's Americanss commences at 18.00; Americans retreat to Fort Erie.
1861 - American Civil War: The Crittenden-Johnson Resolution is passed by the United States Congress stating that the war is being fought to preserve the Union and not to end slavery.
1866 - The United States Congress passes legislation authorizing the rank of General of the Army (now called "5-star general") Lieutenant General Ulysses S. Grant becomes the first to have this rank.
1868 - Wyoming becomes a United States territory.
1897 - Writer Jack London sails to join the Klondike Gold Rush where he will write his first successful stories.
1898 - The United States invasion of Puerto Rico begins with a landing at Guánica Bay.
1907 - Korea becomes a protectorate of Japan.
1909 - Louis Bleriot makes the first flight across the English Channel in a heavier-than-air machine (Calais to Dover in 37 minutes).
1917 - Sir Thomas Whyte introduces the first income tax in Canada as a "temporary" measure (lowest bracket is 4% and highest is 25%).
1920 - Telecommunications: first transatlantic two-way radio broadcast.
1934 - Nazis assassinate Austrian Chancellor Engelbert Dollfuss in a failed coup attempt.
1943 - World War II: Benito Mussolini is forced out of office by his own Italian Grand Council and is replaced by Pietro Badoglio.
1944 - World War II: Operation Spring - One of the bloodiest days for Canadianss during the war: 18,444 casualties, including 5,021 killed.
1946 - Nuclear testing: In the first underwater test of the atomic bomb, the surplus USS Saratoga'' is sunk near Bikini Atoll in the Pacific Ocean when the United States detonates the "Baker Day" device.
July 24 - July 26 - June 25 - August 25 -- listing of all days
January, February, March, April, May, June, July, August, September, October, November, December