The Ohio River formed the southern boundary and the Mississippi River formed the western boundary of the Northwest Territory.
I assume you mean WWI as there were only two. In WWI Americans participated. Many of the able men went to war. While the women, children, and disabled stayed and helped with the war effort. Most of the effort back home was from the women.
Magellan proved Columbus' theory about the shape of the earth. He found an impractical water route to India. He also died before the journey was completed. The only thing that is not true is that Magellan sailed through the Isthmus of Panama.
