The Constitutional clause that prohibits a state to discriminate against citizens of another state is known as the Full Faith and Credit Clause Interstate Compact Clause Extradition Clause Privileges and Immunities Clause

This clause is found in Article IV, Section 2 of the U.S. Constitution and ensures that citizens from one state will have the same rights and privileges in other states. For example, a resident of California can't be denied the right to own property in Texas simply because they’re from out of state. This provision promotes unity and equality among states, encouraging a sense of national identity. Another intriguing aspect is how this clause has evolved through various Supreme Court cases. For instance, in the landmark case of Paul v. Virginia (1869), the Court initially limited its application, but over time, this interpretation has expanded to provide broader protections against discrimination. It’s a vital part of ensuring that all citizens, no matter where they roam in the United States, enjoy a baseline of rights and liberties!