It was on 23 May 1922 that it was recognized as a country.
2015
approximatly 400AD
US is not a state it is a country!
Uh... Mexico is not a state. It is a country.
17 March 1861
July 1 1867
september 15th 1723
no one knows when Greece existence date was
10th 1940 Churchill is not the name of a country. Winston Churchill was Prime Minister of England.
The official birthday of the United States is counted as July 4th, 1776, the day Congress adopted the Declaration of Independence. After that date, unsigned copies were widely circulated, and the date of the declaration has come to be considered the official date. However, the "official" Declaration papers displayed in the Library of Congress -- the ones we usually see reproduced -- were not signed by all of the delegates until about August 2, 1776.
Please specify the country you are referring to so I can provide you with the accurate date of independence.
Canada became an official country at its confederation in July 1, 1867.