The crucial point was the sacking of Constantinople. Basically Western Christians sacking the city and raping and destroying center of Eastern Christianity. If

The crucial point was the sacking of Constantinople. Basically Western Christians sacking the city and raping and destroying center of Eastern Christianity. If Christians would have instead united history could have been quite different. The era of crusades is very interesting and complex. Lots of very important historical events that shaped the world history afterwards happened during those times. Lots of parallels could be drawn even to our current time we are living (hint hint).