Several of these questions are opinion, so I can't really help with those, but I can answer the first one.
After World War I, the League of Nations was created to try to help keep the peace and solve problems between nations. The same went for the United Nations after World War II. There were also the treaties that ended the wars. (You'll have to decide whether or not these were actually successful.)
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Socialism was a new promise from the hell they had endured. Specifically in Russia, as the Bolshevik party began to gain popularity, many working class factory workers sided with Lenin's ideals as it granted "Peace, bread, and land".
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The Spanish missions in the Americas were Catholic missions established by the Spanish Empire during the 16th to 19th centuries in the period of the Spanish Colonization of the Americas. These missions flanked the entirety of the Spanish colonies, which extend ... The missions that were built by members of Catholic orders were often ...
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