Trenton
The first city was Savannah.
Philadelphia
Philadelphia
Newark.
It depends what you mean by major city, but Jersey City, indeed, is a big city. Being in close proximity of New York City, has provided Jersey City with certain advantages (and disadvantages too), in terms of increasing concentration of companies, upmarket condominiums, bars and restaurants. The local economy is dependent on folks who work in NYC and live in Jersey City.
Newark or Atlantic city would qualify.
New York City
New York City, Philadalphia, Folsom, Flint, Grand Rapids
One major city was Wilmington.
Newark of the Essex County and Jersey City of the Hudson county.
Because New Jersey didn't have any natural harbors.
Betsy Ross was from the major colonial city of Philadelphia