The Maya, using their knowledge of astronomy, and building on the Olmec solar calendar, created the most accurate calendar in the ancient world. ... Both the Olmec and the Maya invented many things, but they never used the wheel, and they never made metal weapons or tools.
They were cut off from British goods, because America realized they could no longer depend on foreign goods and so they turned to their own manufacturing.
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The key difference between North Korea and South Korea is that North Korea has a Communist Dictatorial form of government while South Korea has a Republican form of government. North Korea and South Korea are the two countries that reside in the Korean Peninsula.
Explanation: