What was one factor that did NOT contribute to the population growth in the American colonies by 1760?

The unification of the colonies did not significantly contribute to the population growth in the American colonies by 1760. During this period, the population increase was primarily driven by higher birth rates, increased immigration from Europe, and improvements in child survival rates. The colonies were still developing their own identities and had not yet formed a fully unified political or social structure. Therefore, while social and political dynamics were evolving, the process of unification itself did not play a direct role in the demographic growth experienced in the colonies. Rather, it was the combination of familial expansion and immigration that substantially influenced population numbers during this time.