Creation of National Bank
Although this is slightly subjective, it would be "William Shakespeare" who is considered the greatest playwright in the English language, due mostly to his incredibly fluid and "natural" style.
They didn't need to be. They had everything from guns to aircraft. They had everything they needed. They just didn't plan it out in a way causing it not to work.
Yes, it is technically true that John Pershing captured Pancho Villa in Mexico, but it should be noted that this was not a single capture in any way.