The Manhattan Project and Atomic Bomb (video)
The link address is: https://www.khanacademy.org/humanities/ap-us-history/period-7/apush-us-wwii/a/the-manhattan-project-and-the-atomic-bomb
The link address is: https://www.khanacademy.org/humanities/ap-us-history/period-7/apush-us-wwii/a/the-manhattan-project-and-the-atomic-bomb