The requirement that colonists pay for the upkeep of british soldiers is called

Colonists paid Taxes, a strong oppsition was raised when these taxes were hiked due to debts from the seven years war (French-Indian War).

explanation:

with the profits from the european sales, merchants purchased europe's manufactured  goods, including tools and weapons. then the merchants shipped those manufactured  goods, along with the  american  sugar and rum, to west africa where they were bartered for  slaves.