The main purpose of this legislation is to prevent individuals who hold foreign citizenship from being elected to the United States Congress. The objective is to ensure that all members of Congress are solely U.S. citizens, thereby addressing concerns about dual loyalty and foreign influence in American politics. The key provision of this law is straightforward: it prohibits anyone who is a citizen of another country from being elected as a Representative or Senator in Congress. This applies regardless of whether the individual is also a U.S. national.