Which part of the Constitution requires states to provide equal protection of the laws to citizens of other states that are visiting working or conducting business in their state?

The Constitution's Full Faith and Credit Clause, found in Article IV, Section 1, requires states to recognize the public acts, records, and judicial proceedings of other states. Additionally, the Privileges and Immunities Clause, located in Article IV, Section 2, ensures that citizens of one state are entitled to the same rights and protections as citizens of another state when visiting, working, or conducting business. This clause promotes equality and prevents discrimination against non-residents.