1941 - Axis momentum accelerates
The link address is: https://www.khanacademy.org/humanities/ap-us-history/period-7/apush-us-wwii/v/1941-axis-momentum-accelerates-in-ww2
The link address is: https://www.khanacademy.org/humanities/ap-us-history/period-7/apush-us-wwii/v/1941-axis-momentum-accelerates-in-ww2