Which of the following is an effect of pope innocent iii's call for a fourth crusade in 1198 ce? constantinople was sacked by the crusaders. jerusalem was back under christian control. rome became the political capital and united all of medieval europe. cordoba became the new capital of the muslim empire.

The correct answer is Constantinople was sacked by the crusaders.

The original idea was to retake Jerusalem which was under control of Muslims. The idea was to go through Egypt and invade. However, unforeseen circumstances happened and one thing led to another and so it ended with the crusaders sacking Constantinople.