Question

Who were the main supporters of the Federalists in the newly emerged two-party system? common people northern merchants southern farmers state legislators

Answer 1

Northern merchants
supporters of federalism were mainly wealthy merchants from the North.  previously,members of the Federalist party were mostly wealthy merchants, big property owners in the North, and conservative small farmers and businessmen. However, after the great depression those who support a greater government involvement have been southern farmers mainly because of subsidies.

Answer 2

The answer is "northern merchants"