British blockade prevented
food and raw materials from reaching the central powers.
germany's ships from entering their own ports.
germany from collaborating with the central powers countries.
ships from leaving german ports to fight the allies.

it's a to start a war with the americans

the answer is b. you

after the spaniards introduced horses to plains native americans, the lives of the tribes changed. tribes became less settled and sedentary. the horse allowed them to hunt animals such as bison or buffalo, and, instead of staying in one place, tribes began to be nomadic.