to regulate interstate commerce. America needed to evolve into the modern federalism where the country is under the gently guiding hand of the national government, but states still have local influence. They stay in sync with their heritages and culture. States dont have to be completely uniform, but rather just maintain a particular standard. You can see this if you drive around America. States and localities still very much have their individuality. Each has their own set of laws, and regulations. Not every airport allows smoking for example, or is prostitution illegal everywhere. Neither the New Deal nor the Great Society civil rights legislation would have happened if we were still operating under dual federalism. There would be hardly any social programs and minimal commercial ones. So, evolution of federalism was not only necessary but also desirable. ...
