By the mid 1700s, there were over how many people living in the 13 colonies

Explanation:

From 260,000 settlers in 1700, the colonial population grew eight times to 2,150,000 in 1770. (In comparison, the French colonial population grew from 15,000 to 90,000 in 1775, i.e., just 4% of the English total.) In fact, the English colonial population doubled almost every 25 years in the 1700s.

the name of the theory is landmass theory.