WHAT ALL HAPPENED FEBRUARY TO MAY 1911
Find out what all happened February to May 1911

The President of Mexico Porfirio Díaz flees the country during the Mexican Revolution. (31. May 1911)

The works of Gabriele D'Annunzio placed by the Vatican in the Index of Forbidden Books. (9. May 1911)

Following the resignation and death of William P. Frye, a compromise is reached to rotate the office of President pro tempore of the United States Senate. (27. April 1911)

In Standard Oil Co. of New Jersey v. United States, the United States Supreme Court declares Standard Oil to be an "unreasonable" monopoly under the Sherman Antitrust Act and orders the company to be broken up. (15. May 1911)

Tsinghua University, one of mainland China's leading universities, is founded. (22. April 1911)

During the Battle of Deçiq, Dedë Gjon Luli Dedvukaj, leader of the Malësori Albanians, raises the Albanian flag in the town of Tuzi, Montenegro, for the first time after George Kastrioti (Skenderbeg). (6. April 1911)

In New York City, the Triangle Shirtwaist Factory fire kills 146 garment workers. (25. March 1911)

International Women's Day is launched in Copenhagen, Denmark, by Clara Zetkin, leader of the Women's Office for the Social Democratic Party in Germany. (8. March 1911)

At the Indianapolis Motor Speedway, the first Indianapolis 500 ends with Ray Harroun in his Marmon Wasp becoming the first winner of the 500-mile auto race. (30. May 1911)

The New York Public Library is dedicated. (23. May 1911)

Parks Canada, the world's first national park service, is established as the Dominion Parks Branch under the Department of the Interior. (19. May 1911)

The first official flight with air mail takes place from Allahabad, United Provinces, British India (now India), when Henri Pequet, a 23-year-old pilot, delivers 6,500 letters to Naini, about 10 kilometres (6.2 mi) away. (18. February 1911)

Mexican President Porfirio Díaz and the revolutionary Francisco Madero sign the Treaty of Ciudad Juárez to put an end to the fighting between the forces of both men, and thus concluding the initial phase of the Mexican Revolution. (21. May 1911)

Dutch physicist Heike Kamerlingh Onnes discovers superconductivity. (8. April 1911)

The M1911 .45 ACP pistol becomes the official U.S. Army side arm. (29. March 1911)

The hull of the ocean liner RMS Titanic is launched. (31. May 1911)

The Australian Bureau of Statistics conducts the country's first national census. (2. April 1911)