Answer: 21 years
Explanation:
I am pretty sure that, that is the best answer.
C, a nonprofit group that promotes issues of a public concern
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Frederick Taylor is known best for the concept of "management consultant" that improves efficiency in manufacturing. Before this consultants were almost non-existent.
Britain was up to its shoulders in debt from war. The King and Parliament believed they had the right to tax the colonies. They decided to require several kinds of taxes from the colonists, to help pay for the French and Indian War. The colonists started to resist by boycotting, or not buying, British goods. They also rioted so to speak, they would tar and feather officials, dump tea into the ocean and eventually go to war with their motherland.
The Battle of Wounded Knee (1890) clearly marks the closing of the American Frontier.
It was this year, 1890, when the Census Bureau declared the American Frontier closed because all the land within the United States were claimed.
The Homestead Act (1862) offered public lands to anyone who settles in the land for a minimum of 5 years. This lead to the surge of American and immigrants moving to territories that have long been occupied by the Native Americans.
The transcontinental railroad (1869) made it possible for people and goods to be transported and traded to other places.