Answer:
Writing, math, medicine, libraries, road networks, domesticated animals, spoked wheels, the zodiac, astronomy, looms, plows, the legal system, and even beer making and counting in 60s (kinda handy when telling time).
Explanation:
The correct answer would be
A.) by increasing U.S fears of communist expansion
They spread their skills in farming, iron, working and domesticating animals.
To free all slaves from slavery.
The answer is b because of the natural terrain
