How might organizing U. S. history using only this historian's periodization be a problem for a student of history?

because it helps them organize when important events happen and to compare different periods in history. How do historians use eras as a tool to study the past? this helps historians to organize where things happened inthe past.

but whats the question? ?

explanation:

no statements but ok.

the statement that best describes the idea of manifest destiny that was used in the 19th century would be that "it was fate that the united states would continue to  expand westward," since people thought the us was "destined" to do so.