1911

A decade after federation, the Northern Territory and the Australian Capital Territory are added to the Commonwealth of Australia.

Eugene B. Ely lands on the deck of the USS Pennsylvania stationed in San Francisco harbor, the first time an aircraft has landed on a ship.

The first official air mail flight, second overall, takes place in British India from Allahabad to Naini when Henri Pequet carries 6,500 letters a distance of 13 km.

Mexican Revolution: Rebels take Agua Prieta on the Sonora–Arizona border; government troops take the town back April 17, when the rebel leader "Red" López gets drunk.

Mexican Revolution: Pancho Villa launches an attack against government troops in Ciudad Juárez without Madero's permission; the government troops surrender on May 10.

The first Indianapolis 500 automobile race is held in the United States, won by Ray Harroun at an average speed of 74.59 miles per hour.

RMS Olympic arrives in New York at the end of her maiden voyage.

RMS Olympic arrives in Southampton ending her maiden eastbound voyage from New York.

CSKA Moscow, a professional multi-sports club in Russia, is officially founded.

The Wuchang Uprising starts the Xinhai Revolution that leads to the founding of the Republic of China.

Morocco–Congo Treaty brings the Agadir Crisis to a close. This treaty leads Morocco to be split between France (as a protectorate) and Spain (as the colony of Spanish Sahara), with Germany forfeiting all claims to Morocco. In return, France gives Germany a portion of the French Congo (as Kamerun) and Germany cedes some of German Kamerun to France (as Chad).

The Delhi Durbar is held to mark the coronation of George V and Queen Mary as Emperor and Empress of India, and the transfer of the capital of British India from Calcutta to Delhi.