Founding fathers, believe the principle of federalism to be important to put in the constitution, because

Citizens would be guaranteed the right to vote
l the federal government will share power with the state governments
The people would hold the ultimate authority in government
Representative would rule on behalf of the citizens

The founding fathers believed that the principle of federalism was important to put in the constitution because it ensured that power would be shared between the federal government and state governments. This division of power would help to prevent any one government entity from becoming too powerful and potentially infringing on the rights of the citizens. Additionally, federalism allows for a balance of power between the different levels of government, promoting a system of checks and balances that ensures accountability and protects the rights and freedoms of the people.