The river flowed one way while the wind blew the other way which made sailing easier. If you wanted to go upstream you lowered the sails. If you wanted to go downstream you raised the sails
I'm pretty sure this is wrong but my best guess would be John smith. You know, that guy from Pocahontas.
Answer: C The loss of troops convinced Lee and the Confederacy to never again invade the North.
Explanation: I had this question and got it right
Answer: Gulags were started to make money for the Russian goverment, and concentration camps were made to exterminate people.