Question

Why did the leaders of the US decide to create a new plan of government in 1787

Answer 1

American leaders chose to create a new plan of government because they were afraid that, with the plan of government they had already, the new nation would fall apart.

Answer 2

The central government was to weak to impose of their rules and regulations.  Due to the issues, delegates created a new plan in  1787 convention, for a powerful federal government with three branches, executive, legislative and judicial followed by the system of checks and balances to assure that no single branch could exercise too much authority.