Which of these new weapons was instrumental in drawing the United States into World War 1?

poison gas

submarines

machines guns

aerial bombers

B.) Submarines

Explanation:

Germany broke its promise to the United States to stop attacking passenger ships (unrestricted submarine warfare). German leaders knew America entering the war would increase the strength of Allied Powers.

I hope this helps you :)

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it might be to see if the person answering knows what they are talking about other than just saying, "its b hope this ! : )" because they could say it then get the wrong answer because they only answered for the points.