The U.S. Supreme Court has limited personal jurisdiction over foreign corporate defendants to align with international laws. A comparison with EU regulations shows that the Supreme Court's decisions are still based on traditional U.S. jurisdiction principles. The differences make it challenging to harmonize U.S. and EU laws. The EU's approach focuses on clear rules to protect the interests of all parties, while the U.S. prioritizes limiting potential forums for defendants. The EU's method could help improve the shortcomings of the current U.S. jurisdiction system.