> no colonization was driven largely by industrial agrarian production which do to technology advances and other factors became much less profitable and so holding colonies began to become an economic and administrative burden the purpose of colonies was resources and markets. the expense of colonization was not "administration", but soldiers. colonies had to be defended both by foreign rivals, and from rebellions. so the profits from holding them had to be greater than the costs. regardless, british colonialism ended for the same reason rhodesia became zimbabwe and apartheid no longer exists.
United States