The main cause of was russia desire to gain land on the black sea from the ottoman empie

The main cause of the Crimean War was Imperial Russia’s bid to carve out vast territories in the Black Sea peninsula away from the ailing Ottoman empire.  On the pretext of protecting Chistian Orthodox interests Russia invaded the Turkish-held European provinces across the Danube River. 

The Russian aggression pitted the empire  against the British and the French who also have their own interests in the region.

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        i'm fairly sure that the correct answers are 2 and 3.

        i used both my knowledge of world history and the process of elimination to obtain these answers. option 1 cannot be a possible selection because the mandate of heaven belongs to ancient chinese philosophical belief. option 4 sounds like it would benefit the region than detriment it. however, both 2 and 3 explain a potential reason for what could have contributed to the fall of the roman empire.

      hope this ! if i were you, i'd get a second opinion, because i haven't taken this course for a year. best of luck!

***websites that me understand the curriculum better last year are and ***