Here are the fragments needed to complete your passage:
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This approach was known as Dollar Diplomacy.
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Roosevelt's policy had a more aggressive stance,
Inserting these fragments into the passage:
William Howard Taft became president in 1909. His foreign policies differed from Roosevelt’s. Instead of military force, he often relied on the country’s growing economic power. This approach was known as Dollar Diplomacy. Taft decided to “substitute dollars for bullets” to secure markets and opportunities for American businesses. Roosevelt's policy had a more aggressive stance, which was based on the idea that diplomacy has to be backed up with military force.