During world war ii in europe, american troops played a significant role in which of the following?

You have not given any options but let me answer with the most suitable options!

I guess the closest answer is The Normandy Invasions and the D-Day. it was the largest amphibious attack in the human history and the beginning of the decline of the Nazi regime in the mainland Europe and the France.

Moreover, in terms of financial assistance, since the 1941, USA had been supplying the allies with ammunition and all the required war material under the "Lend-Lease Policy".

Hope this helps!

Explanation:

what are the options ?

answer; andrew jackson approved nullification by signing it into law,and john calhoun opposed it saying it was unconstitutional;