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

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.

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.