1921 «Tested & Working»

: A landmark political treaty between Soviet Russia and Iran that established non-interference and restored economic relations.

While "Article" is often used to denote sections within a document, several major events from the year 1921 are frequently cited in scholarly articles: : A landmark political treaty between Soviet Russia

: Also known as the Emergency Quota Act , this was the first U.S. law to establish numerical limits (quotas) on immigration from Europe based on nationality. : A landmark political treaty between Soviet Russia

: An agreement that concluded the Irish War of Independence and led to the establishment of the Irish Free State. : A landmark political treaty between Soviet Russia