What is the role of source in the study of history ?

Describe the factors that led to the truman doctrine as well as how the doctrine affected the us foreign policy

How conditions changed in the american south over the final decades of the 1800s for african americans. consider black politics, black voting, and the rise of segregation

Why were chinese american immigrants frequently detained when trying to immigrate through angel island? the rules for immigration were stricter at this checkpoint due to health issues that were prevalent among asian populations at this time. the location of the island was difficult to reach, and ships to the mainland were often prevented from sailing more than once a week. immigration agents were notorious for asking immigrants confusing questions as a means of denying them entry. low wages caused a shortage of immigration officials, so many immigrants had to wait weeks or months before their applications were processed.