Answer:
Serbian nationalism increased tensions within Europe before World War I. Serbia wanted to create a pan-Slavic state in the Balkans which included Bosnia-Herzegovina, held by Austria-Hungary. Serbia was allied with Russia and Austria was allied with Germany. Russia allied with France. A war between Serbia and Austria threatened to involve the whole of Europe.
Explanation:
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Mexican immigrants is your answer.
Midwestern farmers traveling to Southwest America would be entering into Mexico (before the Mexican-American War), which included present-day Texas stretching to present-day California.
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The treaty of Versailles aimed to crush Germany and to not allow it to rise up and ravage Europe in war again but it didn't plan for the economic problems that the Weirmat Republic had to face. It also didn't help with the matter of fact that Germany had been ruled by a monarch for a good couple hundred years so many political figures didn't know how to make a functioning Democracy.