The plan of government the US used before the Constitution?
Before the constitution, the United States government was based
on the Articles of Confederation. However, these weren't successful
because they gave too much power to the states and not enough to
the central government. For example, the central government
couldn't tax the states, they could only ask for money. The states
didn't have to give them any. Also, the central government couldn't
control trade between the states or the states and other countries.
This meant that the states could charge ridiculous prices for goods
and other countries wouldn't want to trade with the US.