President Donald Trump reportedly entered a war without authorization from the United States Congress based on a commitment to Israeli Prime Minister Benjamin Netanyahu

Study and practice of how sovereign states, international institutions, and non-state actors interact across borders. Encompasses diplomacy, negotiation, alliances, and conflict — the foundational domain through which global order is constructed, contested, and maintained.

The goals, strategies, and diplomatic, economic, and military tools through which the United States engages other states and international institutions, including alliances, sanctions, aid, and the use of force.