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Generally, information develops from specific to broad. An event happens, people report on it, people analyze it, and it becomes a part of the historical narrative. Your research sources should move in the opposite direction, from broad to narrow.

This source features thousands of reference articles on American political, military, social, and cultural history over the past 500 years. Some primary sources may also be found here.
Reference articles from one of the oldest and most trusted reference sources in the world.
This collection of primary and reference sources provides direct insight into the social history of societies ranging from the Australian Aborigines all the way to 21st-century China.
The Asian American Encyclopedia
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Encyclopedia of African American History 1896 to the Present
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Databases:
This source features thousands of reference articles, covering the entire spectrum of African-American history over the past 500 years. Some primary sources may also be found here.
Databases
This source features thousands of reference articles, covering the entire spectrum of African-American history over the past 500 years. Some primary sources may also be found here.
Databases:
This source provides reference articles on over 15,000 years of Native American culture and history, and includes biographies, legends, treaties, and more. Some primary sources are included.
Databases:
A full-text digital resource exploring the history and culture of U.S. Latinx.