Why did French and Austrian troops stop revolts in Spain and
Italy?

balance of power during the Congress of Vienna allowed monarchies of Europe to interfere in other European states' affairs if the monarchies of the other countries were threatened.

Explanation:

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.

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