What about Bryan’s style and substance make his speech so persuasive?

He was a great speaker who was big, larger than life and loud.

russia because it is the biggest state

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.