There are four primary types of economic systems in the world: traditional, command, market and mixed. Each economy has its strengths and weaknesses, its sub-economies and tendencies, and, of course, a troubled history.
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Answer:
A, due to the fact that the railroad disrupted eco systems, and also changed the landscape, it killed buffalo native americans were killing for food, and other changes which proved to be devastating.
Explanation:
<span>The mountains and deserts in western and southwestern China slowed the exchange of ideas</span>
