> The terms used in the definition derive from English legal tradition, specifically the Treason Act 1351. Levying war means the assembly of armed people to overthrow the government or to resist its laws. Enemies are subjects of a foreign government that is in open hostility with the United States.
The Korean War was famously the first of many "police actions" the U.S. would become involved in after WW2, saving Congress the trouble having to turn up to authorize an actual war declaration.
