In the United States, which of the following has the power to declare war?

While the president is the Commander-in-Chief of the armed forces and plays a crucial role in military decisions, they do not have the constitutional authority to declare war without Congressional approval. The president can engage in military actions but must seek Congressional authorization for a formal declaration of war.

The Supreme Court's role is to interpret the law and ensure justice under the Constitution, not to declare war. While it can rule on cases involving war powers, it does not have the authority to engage in or authorize military actions, which is strictly a legislative function.

The National Security Council (NSC) serves as an advisory body to the president on national security and foreign policy matters but does not have the power to declare war. Its role is to inform and guide the president, who must still seek Congressional approval for any formal declaration of war.