Slavery started in the colonies because the colonists needed cheap labor to grow the economy quickly by exporting things to England and some parts of Europe.
A historian would use a calendar when he is trying to find the dates of when the event occurred, such as the dates of a battle, natural disaster, or how long a type of government has ruled.
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The American West was indeed a land of great opportunity from 1865 to 1900 in the sense that there was an abundance of land and resources available to all those willing to go west.
The most controversial provision of the patient protection and Affordable Care Act which is sometimes referred to by its detractors as Obamacare is mandatory health insurance coverage. This is controversial because it would mean that those people who do not wish to buy insurance may be subject to a fine.
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The U.S. government forced the Native Americans to move to reservations in exchange for protection from attacks by white settlers. In addition, the Indians were supposed to be given a yearly payment that would include money in addition to food, livestock, household goods and farming tools. So basically white people were greedy for their land.