What was the most significant american contribution to the allied cause before 1942? ?

a. air support for allied troops
b. military ground force in the pacific
c. war materials leased to allied forces
d. atomic research of the manhattan project

Which best describes the albany plan of union? it was a failed plan to eliminate the colonists’ right to vote.it was a failed plan to unite the american colonies.it was a failed plan to make the colonies independent from britain.it was a failed plan to strengthen individual colonial governments.?