Births on June 20

Thomas Jefferson, American trumpet player

Thomas Jefferson (June 20, 1920 – December 13, 1986) was an American Dixieland jazz trumpeter, strongly influenced by Louis Armstrong.

19 Jan

League of Nations
The United States Senate votes against joining the League of Nations.
8 Mar

Arab
The Arab Kingdom of Syria, the first modern Arab state to come into existence, is established.
19 Mar

Treaty of Versailles
The United States Senate rejects the Treaty of Versailles for the second time (the first time was on November 19, 1919).
28 Apr

Soviet Union
Azerbaijan is added to the Soviet Union.
25 Oct

Sinn Féin
After 74 days on hunger strike in Brixton Prison, England, the Sinn Féin Lord Mayor of Cork, Terence MacSwiney dies.