The Commonwealth of Nations, or The Commonwealth, used to be  associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster to as the  associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster Commonwealth.

It is an international  associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster of 56 member states, the vast  associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster of which are former territories of the British Empire from which it  associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster.
They are connected through their use of the  associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster language and cultural and  associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster ties.
The chief  associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster of the association are the Commonwealth Secretariat, which focuses on  associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster relations, and the Commonwealth Foundation,
which focuses on non-governmental  associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster between member nations. Numerous organisations are associated with and  associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster within the Commonwealth.

The Commonwealth dates back to the first  associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster of the 20th century with the  associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster of the British Empire through increased self- associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster of its territories.
It was created as the British Commonwealth of Nations through the Balfour  associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster at the 1926 Imperial Conference, and formalised by the  associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster Kingdom
through the Statute of  associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster in 1931. In 1949, the  associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster Declaration allowed India to remain in the Commonwealth as a  associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster, marking a significant  associationBritishDeclarationdecolonisationdevelopedEnglishevolutiongovernancehalfhistoricalinstitutionsintergovernmentalLondonmajorityoperatereferredrelationsrepublicUnitedWestminster of the association.

Source: en.wikipedia.org

Historic vs Historical

Historic:
Something important and famous in history (eg a historic battle; a historic occasion; a historic site, historic buildings)

Historical:
Something that belongs to an earlier period of history, the study of things from the past, not legendary (eg historical novels; historical objects; historical figures)