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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Mexicano refused to discuss the matter.
Polk declared that the border between the United States and Mexico extended to the Rio Grande. He ordered American troops to cross into the contested land as a "defensive" act.