11 February 1929 (from Italy); note - the three treaties signed with Italy on 11 February 1929 acknowledged, among other things, the full sovereignty of the Vatican and established its territorial extent; however ...
1 October 1949 (People's Republic of China established); notable earlier dates: 221 BC (unification under the Qin Dynasty); 1 January 1912 (Qing Dynasty replaced by the Republic of China)
1 January 1993 (Czechoslovakia split into the Czech Republic and Slovakia); note - although 1 January is the day the Czech Republic came into being, the Czechs generally consider 28 October 1918, the ...
... 1993 (Maastricht Treaty entered into force) note: Treaties of Rome, which were signed on 25 March 1957 and entered into force on 1 January 1958, created the European Economic ...