The United States has a constitution to guide citizens in everyday life and establish the basic rights of the citizens. The Constitution ensures our rights.
The US has a constitution because it keeps our country together and functioning. The constitution ensures US citizens their basic rights. The constitution also separates federal and state powers, and controls federal and state powers. The constitution also creates separation of powers between the judicial, legislative, and executive branch. In everyday US society, the constitution plays a big part. It gives the people of the US their rights and powers. It also gives us freedom. It also specifies what the government can and can not do, which may be useful during court cases.
The U.S. Constitution uses federalism to divide governmental powers between the federal government and the individual state governments. The Tenth Amendment tells us that all powers not granted to the federal government are reserved to the states.