Children used to work in factories due to child labor. The men would be off fighting in wars and the women would work at factories or stayed at home. With children they didn't have to get paid because of their age and were treated badly. That is why they were chosen to start working in factories.
The Louisiana Purchase helped to double the size of the country and provided control of the Mississippi River. The Louisiana Purchase was a massive land purchase by the U.S. from France under President Thomas Jefferson's administration.
The reason we joined in world war one was due to the germans sinking merchant ships that had US citizens on them and they were also sinking some of our own ships. Due to that President Wilson involved us in the war.
