13.The Political System in USA USA is a republic with a federal system.There are now 50 states altogether,with 48 states on mainland America and 2 states outside mainland America(the Hawaii State is in the Pacific Ocean and the Alaska State is in the northwest corner of North America,which is separated by Canada). The Federal Government is composed of three branches:13.The Political System in USA USA is a republic with a federal system. There are now 50 states altogether, with 48 states on mainland America and 2 states outside mainland America(the Hawaii State is in the Pacific Ocean and the Alaska State is in the northwest corner of North America, which is separated by Canada). The Federal Government is composed of three branches: