I came across this video through a friend on facebook today.
It features a former soldier talking about his role in the war, calling himself a terrorist for following what sounds like rather standard orders that North American soldiers in that region probably hear every day. He blames racism for making ordinary working people willing to fight other working people, when they actually have more in common with those working people than the elites who sent them. He also says that elite people send us to war when it is profitable to do so, and that we agree to go because of racism.
So, if working people around the globe were to realize how much we had in common based on our status as workers and how different the lives and priorities of the elite actually are... it seems like Marxism 101. This theory is very well articulated in the video.