The germans tried to stop supplies from reaching the allies during the war by A. Using propaganda
B. Using submarines to sink ships
C. Threatening to use sanctions
D. Using jet airplanes to shoot down us planes

answer: to communicate with people on the other side.

explanation:

ww1 weapons: tank. tanks were used for the first time in the first world war at the battle of the somme. they were developed to cope with the conditions on the western front. the first tank was called 'little willie' and needed a crew of 3.

confederacy: supported slavery, believed states should be able to nullify federal laws, supported low tariffs

union: everything else