Agriculture and animal husbandry.
The people could now live in one place. The rich and fertile land and rivers produced a surplus of food and water.
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Answer:
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Explanation:
The Supreme Court can disallow a law on the grounds that it was unconstitutional thus establishing the of judicial review and the authority of Supreme Court as the watchdog of the constitution.
Today, two (2.5) children constitute Americans' ideal family size.
Two children is enough to replicate both parents which means that there will always be a steady number of young and old people in a country. Having two children is ideal - anything below that would result in a smaller population.