It was "<span>2. Meriwether Lewis and William Clark" who famously </span>explored the Louisiana Territory in the early 1800s--a territory purchased by Thomas Jefferson from Napoleonic France for an incredibly small amount of money.
Lead the rise of Totalitarianism, which left Europe in small parts and Germany and Italy was not happy about that so they had grown their armies, which led the rise of World War. <span />
It freed the serfs who had been bound on the land for 10 or more years
