What do the Battle of Verdun, the Battle of the Somme, and the Third Battle of Ypres have in common? A They were quick and decisive Ally victories.
B
New weapons were introduced.
С
Germany gained a lot of ground,
D
They resulted in very high numbers of casualties.

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

d. it adversely affected american productivity

an interest group is an organization whose members share common concerns, and try to influence government policies that impact those concerns. elected officials frequently complain about the influence of "special interests" on american politics.