HELPP QUICK "A provision of the Treaty of 1818 that expanded the United States also O gave it sole control of the Oregon Territory.
O gave it sole control of West Florida.
O set the US-Canada border at the forty-ninth parallel.
O set the US-Spain border in Cuba.

the answer is a) the proclamation of 1763.

mexico south america

explanation:

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).

b is the answer i am assuming