How did the system of alliances established prior to 1914 ensure that a regional conflict would become a European-wide war?

By 1914, too many countries were willing to go to war to achieve their objectives and instead of guaranteeing peace, these alliances ensured that the war swiftly involved all the nations that had joined them. The army had a more important place in Germany than in any other European country. For almost 100 years, from 1814/1815 until 1914, they were used to manage Great Power politics. Alliances could bolster cooperation among all or at least most of the Great Powers, as in the case of the Quadruple Alliance, which would form the basis of the European Pentarchy and the Concert of Europe.

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the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain