Independence or Birthday for Every Country The vast majority of the countries on earth became independent after 1800. Only 20 were independent before the start of the 19th century, a mere 10%. By 1900, only 49 or 25% of the world's countries of today were independent. Many countries became independent following World War II when European powers granted independence to their vast colonial holdings, especially Africa. Here are the independence days for every country, from the oldest to the youngest... 660 BCE - Japan 221 BCE - China 301 CE - San Marino 843 CE - France 976 CE - Austria 10th Century CE - Denmark 1001 - Hungary 1143 - Portugal 1206 - Mongolia 1238 - Thailand 1278 - Andorra August 1, 1291 - Switzerland 1419 - Monaco 15th Century - Spain 1502 - Iran June 6, 1523 - Sweden January 23, 1579 - Netherlands 1650 - Oman May 1, 1707 - United Kingdom January 23, 1719 - Liechtenstein 1768 - Nepal July 4, 1776 - United States of America January 1, 1804 - Haiti July 20, 1810 - Colom...