The post-World War II era promised a new international order rooted in law and human rights, yet the pursuit of national interests often overrides these ideals. In the wake of the September 11, 2001 attacks, the United States launched a Global War on Terrorism, challenging and reshaping fundamental legal principles on both domestic and international fronts. These reshaped principles have influenced how the United States has approached global conflicts in Gaza and Ukraine. This course delves into the intricate legal and constitutional issues raised by these policies, examining how these actions have redefined the boundaries of international law. Key topics include domestic measures such as the USA Patriot Act, warrantless surveillance, and indefinite detention, alongside international issues like preemptive military strikes, extraordinary rendition, and the treatment of detainees. Spanning four presidential administrations, this course critically analyzes the evolution of U.S. policies, exploring how legal frameworks have adapted—or faltered—amid shifting political landscapes and security challenges. Students will grapple with the tension between safeguarding security and upholding the rule of law in a world marked by constant threats and evolving norms.