Answer:
States gained a large piece of western land know as the Mexican session cession.
Answer:
The battle of Stalingrad prevented Germany from successfully gaining control of Moscow.
Explanation:
Germany's failure to capture Stalingrad ultimately led to Germany's failure to capture Moscow and defeat the Soviet Union. Capturing Stalingrad would've given Germany access to the USSR's oil supply, giving the Germans the upper hand against fighting the Russians. They weren't able to successfully capture and had to back off from the offensive.
<em>Good luck, i hope this helps :)</em>
Germany and Soviet Union
(They did not declare war on the Soviet Union though)