id author title date pages extension mime words sentences flesch summary cache txt en-wikipedia-org-5629 History of the United States - Wikipedia .html text/html 33049 2899 66 Led by General George Washington, it won the Revolutionary War with large support from France, and additional help from Spain[2] and the Netherlands.[3] The peace treaty of 1783 gave the land east of the Mississippi River (including portions of Canada but not Florida) to the new nation. The New Deal defined modern American liberalism.[4] After the Japanese attack on Pearl Harbor in 1941, the United States entered World War II and financed the Allied war effort and helped defeat Nazi Germany and Fascist Italy in the European theater. Main articles: Origins of the American Civil War and History of the United States (1849–1865) It remains the deadliest war in American history, resulting in the deaths of about 750,000 soldiers and an undetermined number of civilian casualties.[106] About ten percent of all Northern males 20–45 years old, and 30 percent of all Southern white males aged 18–40 died.[107] Its legacy includes ending slavery in the United States, restoring the Union, and strengthening the role of the federal government. ./cache/en-wikipedia-org-5629.html ./txt/en-wikipedia-org-5629.txt