Answer: I'm almost 100% sure that the 2nd one is correct, but I would wait for another opinion as well.
Explanation:
The answer is c because having control over light in homes made a big difference. .
I believe it was Austria.
The answer is B. Development of railroad systems.
One of the main ways in which the United States attempted to strengthen its ties and influence with the nations of Latin America was by declaring that further attempts to colonize this area by Europeans would be met with resistance by the US--as embodied in the Monroe Doctrine.