He invented dynamite.
He gave all his money to the Swedish Institute for the Nobel prize because he was accused of gaining wealth from selling weapons to warlords so he wanted to show that he is not corrupt and that he wants to help people instead of allowing them to wage war more easily.
The answer is D. economic problems in one nation spread to other nations.
The Answer is a I just took the test, and it didn't eliminate the need of a railroad, nor was it constructed on a land with few plants or animals, it was in a jungle like environment.
ANSWER IS A
1. I would say the Truman doctrine was a response to Chinese communism as President Truman wanted to give European countries economic assistance and resist communism.
2. The Korean War was a result of North Korea invading the south.
3.NASA was founded in response to Soviet technological gains, I believe.
I hope you find these answers useful, I myself have just started this topic