The Privileges and Immunities Clause, rooted in the Articles of Confederation, aims to ensure equal treatment of citizens across states. It promotes unity and prevents discrimination, reflecting the Founders' desire to create a cohesive nation where citizens can freely travel and conduct business. This clause is closely related to other constitutional provisions like the Commerce Clause and Equal Protection Clause. The Supreme Court has interpreted it narrowly, focusing on fundamental rights such as the right to travel and pursue a livelihood across state lines.