Births on May 18

Kalju Pitksaar, Estonian chess player (d. 1995)

Kalju Pitksaar (18 May 1931, Tallinn – 26 September 1995, Tallinn) was an Estonian chess player, who won the Estonian Chess Championship.

20 Feb

San Francisco-Oakland Bay Bridge
The Congress of the United States approves the construction of the San Francisco-Oakland Bay Bridge by the state of California.
19 Mar

Nevada
Gambling is legalized in Nevada.
23 Mar

Indian independence movement
Bhagat Singh, Shivaram Rajguru and Sukhdev Thapar are hanged for the killing of a deputy superintendent of police during the Indian struggle for independence.
1 Oct

Women's suffrage
Spain adopts women's suffrage.
7 Nov

October Revolution
The Chinese Soviet Republic is proclaimed on the anniversary of the October Revolution.