Answer:The answer is B cause I took it on USA test prep
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Answer:
I think it's A. I could be wrong lol
Explanation:
Answer:
Before things like mountains were typically boundaries since they were a pain in the butt to cross. But with modern planes, and depending on the mountian, cars, mountains aren't as big a pain anymore. Deserts might have also been a boundary before. Today you turn on the AC and drive straight across it. At least for technologically advanced western countries, there really isn't any geographic feature we can't easily get around.
Greatly contributed to economic and cultural development of the Americas.
The answer is B. the clock
the clock was invented hundreds of years before he was born
