Apparently you Americans need a history lesson.
Canada was fighting in World War II LONG before America got involved. Canada entered the war on September 10, 1939. (I remember that date because it's my daughter's birthday.) America didn't get involved at all until much later (November 1940). That's a year and two months after the war started! So don't say we never backed America up. It's the other way around.
As for World War I, Canada was a commonwealth nation at that point, and thus we had to join the war at the exact moment Britain did. Which also means we were dying on the battlefield long before the states even knew there was a war going on.
We also got fully involved in the Gulf War.
Read a book. You find lots of interesting things in them.
Happy Independance Day, neighbors.