There was a severe economic depression world-wide
Sundiata took over Ghana.
Mansa Musa brought Muslim scholars, artists, and teachers to Mali.
Mali became the center of trans-Saharan trade.
Songhai overtook Mali.
If you are referring to the letter from the "dust bowl" then Grace takes its all very well. She's optimistic, takes advantage of lulls (calm) in the action, and she helps her family the best she can. I'd say she's a trooper!
He was the commander and chief of the continental army
Yes, this is true. It provoked outrage at the tax increase of King George.