After Jamuka's attack on his camp, Genghis decided that the only way to unite the tribes was
to

sorry its a lil late, but the answer is d. the rotation 180° about z'

the exodus of these people from constantinople contributed to the revival of greek and roman studies, which led to the development of the renaissance in humanism and science. byzantine emigrants also brought to western europe the better preserved and accumulated knowledge of their own greek civilization

the united states broke it's neutrality was the constant german sinking of trading vessels resulting in the loss of lives, one example would be the lusitania.

d the foreign governments