The Civil War started because of uncompromising differences between the free and slave states over the power of the national government to prohibit slavery in the territories that had not yet become. I believe so.
Answer:
World War I, which led many to embrace strong nationalistic and anti-immigrant sympathies;
The Bolshevik Revolution in Russia, which led many to fear that immigrants, particularly from Russia, southern Europe, and eastern Europe, intended to overthrow the United States government;
The end of World War I, which caused production needs to decline and unemployment to rise. Many workers joined labor unions. Labor strikes, including the Boston Police Strike in September 1919, contributed to fears that radicals intended to spark a revolution;
Self-proclaimed anarchists' mailing bombs to prominent Americans, including United States Attorney General A. Mitchell Palmer and United States Supreme Court Associate Justice (and former Massachusetts Supreme Judicial Court Chief Justice) Oliver Wendell Holmes, Jr.
The Pentagon Papers "<span>were a secret study of the history of U.S. involvement in Vietnam," since their conclusions were highly controversial and the Johnson Administration initially blocked their release. </span>
Your answer would be A because the Emancipation Proclamation only freed the slaves in the south until the South decided to come back to the US.
The answer is B since the treaty of Versailles placed harsh punishments on the Germans which led directly to world war 2