Astrolabe? I’m guessing that because I know that those helped sailors avoid the wind in a certain direction but I could be wrong.
To ease the Cold War tensions and potentially end the war he proposed the SALT I treaty. This treaty essentially outlawed the use of nuclear weapons. Bringing the Cold War to an end.
Answer:
The North did not allow slavery, while the South depended on it. ... The North grew its own food, while the South focused on cash crops and imported most of its food.
A . medical advances generally improve standards of living for people in developed and developing nations