The article gives a quick overview of how U.S. immigration policies have changed from the past to now. It talks about the history of immigration laws and how they affect today's political debates. The U.S. has an old and confusing immigration system controlled mostly by the president. Congress has the power to make immigration laws, and past decisions still influence current policies. The article aims to help us understand the ongoing immigration debate in the U.S. at the start of the Biden administration.