Answer:
a
Explanation:
so so sorry do not know b
The US joined in: December 7, 1941.
The reason why Stalin pushed so hard for the US and Britain to open a second front against Germany was because Russia was bearing the burden of Germany's advance all by itself, and was suffering a great deal of losses in the process.
Answer: Im pretty sure its replace manual laborers and manufacture cars, run spaceships, make toys.
Explanation: If artificial intelligence becomes smart enough they can replace workers.
Here so the other guy gets brainiest :)