With a focus on causation what are some of the explanations for the growing weakness of the byzantine empire in the centuries before 1450

For eleven centuries the Byzantine Empire resisted a series of conflicts that lasted in and out of its territory. Although considered one of the strongest States in the Mediterranean, the empire had to face several conflicts that weakened its power over the time.

One of the factors that influenced was the Fourth Crusade, which ended up disintegrating its military forces. Ottoman invasions  that occurred without success; and again in Constantinople (1453), this last one successfully, Constantinople was not able to resist the power of the invaders.

alliances in ww1 were different from ww2 because the entente in ww1 made up of serbia,russia,france,britan,japan and italy later america  and all allied in a sort of balance of power and too keep germany,austria-hungary,and the ottomans down. russia allied the serbians in order to exert its influence in the balkans while france allied the russians because france was still in dismay and insulted after the defeat to the germans during the unification of germany and britian allied the belgians after the germans invasion of belgium.in ww2 the alliances were in a preemptive attempt to deter any further wars into happening while germany and italy allied since they were insulted and humiliated after the previous war while also sharing a similar ideology of facsim along with japan which all 3 had a want for world domination and agreed to assist one another in the endevours 

explanation:

what precedent do you see the ordinance of 1787 setting for the 1st amendment of the us constitution : )

this person under me, copied me. owo