The political and economic characteristics that made possible United States expansion through the different events in the past, are very different from today. It could be possible for the United States to expand in the present, but certainly, it would happen by negotiations and following the international organizations pacific means.
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...right?
Oligopoly! :) Hope this helped!
Answer: D. Market economy
Explanation:
A market economy is known to be an economy in which the market is controlled by the mechanism of demand and supply. Furthermore, there exist private ownership of the means of production and distribution in which they have the right to produce and sell their products. Thus, private businesses exist with the sole aim to get profit and revenue.