Which statement is an example of evidence a historian could use to support a claim about the american civil war

The roosevelt corollary, issued in 1904, was a revision to what earlier statement of u.s. foreign policy?

What event brought the us into wwii? what conflicts happened after the us entered the war? i know the first part of this question, i need with the second part.

What types of modernization did atatürk introduce? give examples.