The answer is true. There
was several times where the United States restricted the entry of certain
groups of people into their country. These
was regulate who would enter their country.
Today that is no longer being practiced as restrictions are now being
removed.
Answer: No
Explanation: It's because the powers not delegated to the United States by the Constitution, nor prohibited by it to the states, are reserved to the states respectively, or to the people. In other words, states have all powers not granted to the federal government by the Constitution.