They wanted there property protected and a strong central goverment.
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The middle colonies didn't have the large number of farms or plantations, so the class of merchants were where the wealth was held.
To show anti-federalists as well as the general public that the Constitution is a great thing.
Many Federalists were large land owners who wanted the property protection that a strong central government could provide. Supporters also included merchants and artisans in large coastal cities.
The Declaration of Independence was exactly as it sounds, and the Constitution was crafted, in large part, around trying to solve the problems of government that the Declaration complained of.
Merchants trading on a large scale, some entrepreneurs and early manufacturers.