Originally Posted by SilentKnight

Dear 'Ringleader':

It depends on what measuring stick you're using.

Canada entered WWII in Sept./1939 - the U.S. in Dec./1941...two years after Canada had declared war on Germany.

During the course of the war 730,000 Canadian men and women served in the army, 260,000 served in the air force and 115,000 served in the navy. Canadians distinguished themselves at several theaters of the war most notably at Dieppe in France in 1942, the invasion of the Italian peninsula in 1943, the liberation of the Netherlands and the Allied invasion of German occupied France from Normandy in 1944.

From June/1940 to July/1941 Britain stood alone against Germany and without Canadian assistance likely would have fallen to German forces.
The battle of the Atlantic was largely the responsibility of Canada. The UK was heavily involved as well, but the US was largely absent from this theatre until very late in the war.

Before you let your American 'arrogance' run away with itself - don't forget Kasserine Pass in Tunisia where American troops ran like rabbits and had to rescued by British and French troops.