What was the real cause of the split between the Greek Orthodox Church and the Roman Catholic Church?

Was the split caused by political, doctrinal, different canons, linguistic differences, or other? And what was the name of the Church before the split, if there was any? Or were there many loosely organized churches instead? Bishopries independent of each other were scattered throughout the Mediterranean region in the early centuries. What determined whether they aligned with the Greek Orthodox, or the Roman Catholic church? And was the choosing to go one direction or the other amicable, or traumatic? Note that some of the ancient Councils of bishops were very hostile with bishops bringing their own Body Guards!. Is the splitting of denominations as simple, as some suppose, merely attributed to the difference in language: the Latins congregating in the west, and the Greek-speaking ones joining the East?