Turkey
29 October 1923 (successor state to the Ottoman Empire)
Turkmenistan
27 October 1991 (from the Soviet Union)
Turks and Caicos Islands
none (overseas territory of the UK)
Tuvalu
1 October 1978 (from the UK)
Uganda
9 October 1962 (from the UK)
Ukraine
24 August 1991 (from the Soviet Union)
United Arab Emirates
2 December 1971 (from the UK)
United Kingdom
12 April 1927 (Royal and Parliamentary Titles Act
establishes current name of the United Kingdom of Great Britain and
Northern Ireland); notable earlier dates: 927 (minor English
kingdoms united); 3 March 1284 (enactment of the Statute of Rhuddlan
uniting England and Wales); 1536 (Act of Union formally incorporates
England and Wales); 1 May 1707 (Acts of Union formally unite England
and Scotland as Great Britain); 1 January 1801 (Acts of Union
formally unite Great Britain and Ireland as the United Kingdom of
Great Britain and Ireland); 6 December 1921 (Anglo-Irish Treaty
formalizes partition of Ireland; six counties remain part of the
United Kingdom as Northern Ireland)
United States
4 July 1776 (from Great Britain)
Uruguay
25 August 1825 (from Brazil)