Canada has historically been a close ally to the United States, and their foreign policies often work in conjunction. The armed forces of Canada and the United States have a high level of interoperability, and domestic air force operations have been fully integrated between the two countries through NORAD. Almost all of Canada's energy exports go to the United States, making it the largest foreign source of U.S. energy imports; Canada is consistently among the top sources for U.S. oil imports, and it is the largest source of U.S. natural gas and electricity imports.See Energy Information Administration, "Canada" (2009 report) Trade between the United States and Canada as well as Mexico is facilitated through the USMCA.
cAnada Has hIStorICalLy beEN a CloSe alLY to the UniteD STaTeS, anD TheIr fOreigN poliCIes ofTen work in ConjunctiOn. THE aRmed fOrcES Of cAnada and the uNIted StATEs HAVE a high LEvel Of iNTeRoperABiLiTy, and doMestiC Air foRce OpeRaTioNs have been fUlly iNtegRaTEd betwEen tHe two cOuntries ThRoUgh nOrad. almOsT all of cAnadA's enERGy exports gO to ThE uNited StaTES, mAking It the larGEst FOrEiGn souRCe Of u.S. eNergY impoRTs; caNAdA Is COnSistenTly amonG the top sourcES FOr u.s. oiL IMpoRTS, And it iS THe larGEst soUrce oF u.s. NatUrAL gaS aNd ElectRICity IMpORts.sEe eNergy inFoRMatIon AdministrATioN, "CanaDa" (2009 REpOrt) traDe beTwEen The unIteD states And cAnADA As well As MExiCO is FacIliTated through ThE uSmca.