World war ll

in 1941 , to protect american shipping in the atlantic, the unites
a) sent to protect united states navy into the war zone.
b) permitted american ships to exchange fire with the germans.
c) allowed merchant ships to be armed.
d) put marines on each merchant ship.

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).

it was the first major victory for the colonists.