<Tr> <Th_colspan="2"> Commonwealth of Nations </Th> </Tr> <Tr> <Td_colspan="2"> Flag Logo </Td> </Tr> <Tr> <Td_colspan="2"> Member states of the Commonwealth </Td> </Tr> <Tr> <Th> Headquarters </Th> <Td> Marlborough House London, SW1 United Kingdom </Td> </Tr>

How did countries become part of the commonwealth