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.

both are true, the congress does have the power to create banks, even if this power is not specifically described in the constitution, since there is nothing restricting it and there is power given to the congress to make "all laws which shall be necessary and proper". maryland was not allowed to tax a branch of the national bank operating there, and the supreme court decided that no state could. both of these topics were discussed in a decision of the mcculloch v. maryland case in 1819.