Sources are used in a paper to show what ideas inspired you and whose theories you would be using and you cite the sources in order to avoid plagiarism. If you don't have sources, your paper will not be valid and you could get accused of plagiarism. The more sources you use the better but you should keep in mind that they need to be important for the paper and used with a purpose and not just to increase the number of sources.
A top secret study of the U.S involvement in Vietnam is known as the...
Pentagon Papers!
Answer:
Most people associate slavery with the American South. However, slaves were utilized in the Caribbean, as well as in all parts of the original colonies and territories that later became the United States. From the time Christopher Columbus (1451–1506) arrived in the Caribbean in 1492, Caribbean Indians were enslaved to work in mines and on plantations. Later, the Spanish began importing African slaves to work the sugar plantations. Because sugar crops required quick processing to avoid spoilage, Caribbean slave life was much harsher than that of slaves in North America. Nineteen-hour days and harsh working conditions led to disease and high death rates. Rather than improve conditions, plantation owners simply increased the number of slaves they imported.
Positive--resulted in the lowering of the voting age to 18, contributed to the end of the Vietnam War, contributed to furthering the civil rights movements of the time.
Negative--they were violent and led to the deaths of many in riots and shootings, their means were not taken seriously by adults and conservatives of the time,