Which of these is a power of the legislative branch?
a) declare war
b) enforces laws
c) interprets laws
d) negotiates treaties

The correct answer is declare war.  

Only Congress (the Legislative branch) has the power to declare war. The last time Congress declared war was in 1941 following the Japanese attack on Pearl Harbor. The U.S. has still been in many armed conflicts since then, but even though we call them "wars" (Vietnam War, Korean War, etc) they have not technically been declared wars.

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