Why did Pennsylvania and New York City Grow to become The largest and wealthiest cities in the colonies?

Explanation:

NewYork: First, the port of New York came to dominate American shipping and immigration completely. Second, New York exploded as a manufacturing town, as industries such as sugar, publishing, and most importantly the garment trade clustered around the port.

Pennsylvania:  American Indian groups and fertile farmland helped Penn's experiment become a success. Pennsylvania grew into one of the most important cities in colonial America, becoming the birthplace of the U.S. Constitution.

it was on the rise and doing very well and would continue to do well until the great depression from 1929-1939