- Meg Jacobs: Trump's promise to get tough in the Middle East isn't new foreign policy
- Making oil policy with military force is a GOP approach dating back to the 1970s, she says
Meg Jacobs teaches history at Columbia and Princeton. She is the author of a new book, "Panic at the Pump: The Energy Crisis and the Transformation of American Politics in the 1970s" (Hill and Wang). Unless otherwise noted, facts included here reflect that book's research. The opinions expressed in this commentary are hers. Follow her on Twitter @MegJacobs100.
(CNN)Donald Trump delivered an important speech on Wednesday about how he plans to make America great again by "shaking the rust off America's foreign policy." This effort to convey an image of a serious candidate is part of the new phase of his campaign, as he tries to move away from the vitriol with big visions for American policy. His tone was more somber, more presidential, and less brash than his previous rhetoric.