Answer:
the proliferation of nuclear weapons and technology
Explanation:
The silk road gave people new places to explore and new things to trade. The silk road boosted trade.
Answer: What Americans had in enthusiastic spirit, they lacked in military strength. The navy, although improved, was simply a shadow of what it would become by World War I.
Explanation: I had a question similar to this on an assignment, and i got it right and i used this answer
Source: https://www.ushistory.org/us/44d.asp
Positive: <span>faster and safer transportation from coast to coast, larger amount of goods ship faster, cheaper for travel, and helped unpopulated areas get settled easier
Negative: Buffalo were killed in large numbers, Natives lost their land, and brought a lot of western settlers take over native lands.</span>