How have rhetorics become a major part of leadership?

what do the rhetorical styles of Obama and trump reveal about their leadership skills? https://theconversation.com/trump-and-obama-have-one-surprising-thing-in-common-the-words-they-use-81309 Defining Leadership Retracing a pattern of desirable leadership skills( American Presidents (2000-2020) (Highlighting the leadership styles of Obama and Trump) What has changed? How have rhetorics become a major part of leadership? Is it solely an American Phenomena ?( short comparison with populist leaders; reassuring the masses by blaming the other, notably in Trump’s case) Political linguo Sources: Journals & Articles Book: Rhetorical Style: The Uses of Language in Persuasion, Jeanne Fahnestock https://www.theguardian.com/world/ng-interactive/2019/mar/06/revealed-the-rise-and-rise-of-populist-rhetoric https://www.theguardian.com/books/2016/aug/27/from-trump-to-brexit-rhetoric-how-todays-politicians-have-got-away-with-words https://www.huffpost.com/entry/barack-obama-donald-trump-quotes_n_579a155fe4b02d5d5ed489ce https://www.bbc.com/news/newsbeat-37921876 https://www.kqed.org/lowdown/25170/slightly-different-visions-comparing-trump-and-obama-inauguration-speeches