What is a federal system of government and why did the framers choose to design a federal system of government for the united states?

A federal system of government exists when power is shared between a central, federal body, and smaller entities such as states. The Founders chose this because they wanted to protect state and individual rights while making sure that the country had a strong central power. 

Ican't tell you the exact answer, but i can  tell you that 24% of the state is covered by forests