May 1905

Monday 15:

Las Vegas, Nevada, is founded when 110 acres (0.4 km²), in what later would become downtown, are auctioned off.

Saturday 27:

Russo-Japanese War: The Battle of Tsushima begins.

Sunday 28:

Russo-Japanese War: The Battle of Tsushima ends with the destruction of the Russian Baltic Fleet by Admiral Togo Heihachiro and the Imperial Japanese Navy.