Which of the following weapons helped continue the stalemate on battlefields during World War I a] the tank
b] the submarine
c] the fighter plane
d] the machine gun

The answer to this is D machine gun.

Explanation:

The machine gun allowed soldiers to rapid-fire bullets at the enemy at a rate of 400 to 600 rounds per minute. This allowed defenders the ability to dominate the battlefield and cause the death of advancing enemy soldiers.

I think It was the tank

Explanation:

the first prototype was created in 1916

im the bozz no matter what

in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

explanation: