Answer: the yellow river and the yangtze river
it compelled citizens to return slaves to their "rightful" owners
Frederick Jackson Turner and the frontier. A year after the Oklahoma Land Rush, the director of the U.S. Census Bureau announced that the frontier was closed. The 1890 census had shown that a frontier line, a point beyond which the population density was less than two persons per square mile, no longer existed.
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Answer:
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Deterrence theory is the idea that an inferior force, by virtue of the destructive power of the force's weapons, could deter a more powerful adversary, provided that this force could be protected against destruction by a surprise attack. This doctrine gained increased prominence as a military strategy during the Cold War with regard to the use of nuclear weapons and is related to, but distinct from, the concept of Mutual assured destruction, which models the preventative nature of full-scale nuclear attack that would devastate both parties in a nuclear war.
Explanation:
The tiny invaders being discussed in the article are plants. They are considered invaders because they came from other countries, but are now threatening the native plants. People brought them in because they wanted to make their gardens and yards beautiful because the plants are very rarely found locally.
