Comparing the 1800s to the 2000s,the "openness ratio" of the United States has

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The term "openness ratio" generally refers to how open a country is to trade and investment from other countries. In the 1800s, the United States had relatively high tariffs and other trade barriers, which limited its openness. In the 2000s, the United States has generally pursued a more open trade policy, including signing free trade agreements with many other countries. Therefore, the openness ratio of the United States has increased.

Comparing the 1800s to the 2000s,the "Openness Ratio" of the United