Please help ! What major event pictured .
was a primary reason for the United States becoming involved in world war ?

A /Sinking of the United States freighter carrying soldiers to Cuba

B: sinking of the United States freighter carrying weapons to Allies

C: sinking of the United States warship

D: sinking of the Lusitania

D: sinking of the Lusitania

Explanation:

the sinking of the lusitania would take the lives of thousands of merchants and other civilian passengers, leading to the american public opinion to go against germany. this would lead to america joining the war 2 years later

i thinl it is the 1st answer

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).