Why did America choose a federal form of government?
Answer: It was forced on us.
“Liberty, sir, was then the primary object.”
“We are descended from a people whose government was founded on liberty; our glorious forefathers of Great Britain made liberty the foundation of everything. That country is become a great, mighty, and splendid nation; not because their government is strong and energetic, but, sir, because liberty is its direct end and foundation. We drew the spirit of liberty from our British ancestors; by that spirit we have triumphed over every difficulty. But now, sir, the American spirit, assisted by the ropes and chains of consolidation, is about to convert this country into a powerful and mighty empire. If you make the citizens of this country agree to become the subjects of one great consolidated empire of America, your government will not have sufficient energy to keep them together. Such a government is incompatible with the genius of republicanism. There will be no checks, no real balances, in this government.”
— Patrick Henry, speech in the Virginia Convention on June 5, 1788 urging for a Bill of Rights