Ukraine
Independence Day, 24 August (1991); note - 22 January 1918,
the day Ukraine first declared its independence (from Soviet Russia)
and the day the short-lived Western and Greater (Eastern) Ukrainian
republics united (1919), is now celebrated as Unity Day
United Arab Emirates
Independence Day, 2 December (1971)
United Kingdom
the UK does not celebrate one particular national
holiday
United States
Independence Day, 4 July (1776)
Uruguay
Independence Day, 25 August (1825)
Uzbekistan
Independence Day, 1 September (1991)
Vanuatu
Independence Day, 30 July (1980)
Venezuela
Independence Day, 5 July (1811)
Vietnam
Independence Day, 2 September (1945)
Virgin Islands
Transfer Day (from Denmark to the US), 31 March (1917)