Between 500 and 1450, a rivalry developed between the christian european states and?

maybe you need to work on the pipes in the house. i am just saying this because you did not give any details.

answer; the above statement is (false);

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).

i belive the continental association was created to boycott all contact with british goods.

i also belive it was in december 1, 1774