The Constitution of the United States established Americas natural government and fundamental laws, and guaranteed certain basic rights for its citizens. If your learning about federalist and Anti federalist then this part is for you!! Federalist- For the constitution and the Anti federalist were against because they thought the rich and privileged would control all power and the anti federalist did not want another King George The Third!! The anti federalist argued with the Federalist to put a set of amendments calls the bill of rights. The Bill of rights is the first 10 Amendments!!