Think Like a Historian (Khan)
The link address is: https://www.khanacademy.org/humanities/ap-us-history/general-ap-us-history-skills-and-test-strategies/apush-how-to-think-like-a-historian/v/thinking-like-a-historian
The link address is: https://www.khanacademy.org/humanities/ap-us-history/general-ap-us-history-skills-and-test-strategies/apush-how-to-think-like-a-historian/v/thinking-like-a-historian