How did the fourth crusade contribute to the byzantine empire's downfall?

The fourth crusade contributed to the Byzantine empire's downfall because it left Constantinople permanently damaged after the crusaders looted its valuables.

The fourth crusade was a christian expedition carried out under orders of the pope at that moment, Pope Innocent III seeking to recapture Jerusalem which was being controlled by Muslim people, so with that purpose, the Latin Christians decided to first conquer the Egyptian Ayyubid Sultanate.

these conditions long with a short growing season made farming difficult.

explanation:

the north has a climate of warm summers and snowy cold winters. the terrain is rocky, hilly, and not good for farming.

in 550 b.c.e. cyrus the great, the leader of the persians, conquered the medes and united the iranian people under one ruler for the first time. cyrus became the first king of the persian empire and went on to establish one of the largest empires in world.