As a nation, what is the United States often called?

The United States is the most populous nation in the world, ranking behind China and India.

Officially the United States of America began as an independent nation with the Declaration of Independence in July 1776.

History shows that the United States as a nation _____ a great deal _____ the African-Americans(非洲裔美国人).

The United States has a large population of 323 million, which makes it the __________ populous nation in the world.

Drugabuse in the United States has come, to be regarded as one of the mostchallenging social problems facing the nation

Which nation is not a member of the North American Free Trade Association? A: Canada B: Greenland C: Mexico D: United States

According to the statistics in 2012, the United States is the _______ most populous nation in the world. A: first B: second C: third D: forth

History shows that the United States as a nation ________ a great deal ______ the African-Americans(非洲裔美国人). A: applies…to B: leaves…to C: owes…to D: comes…to

Globalization is criticized because it increases the power of _____. A: governments to own enterprises B: unskilled labor to form labor unions C: supranational organizations over nation-states D: nation-states to regulate markets and reduce competition