The british officially recognized america’s independence in 1783 when

The Treaty of Paris was signed on 3rd September 1783.

Explanation:

The Treaty of Paris was a treaty that was signed on 3rd September 1783 by the representatives of George III and the U.S. representatives to end the Revolutionary War in America. This treaty established the borders between the British Empire in North America and the U.S.A.  on series "extremely generous" to the following.

explanation:

the president, prime minister, chief justice, speakers and ministers take their oath of office. the oath is taken in bengali