Authored by Eric Zuesse via The Strategic Culture Foundation,
The following is entirely from open online sources that I have been finding to be trustworthy on these matters in the past. These sources will be linked-to here; none of this information is secret, even though some details in my resulting analysis of it will be entirely new.
It explains how and why the bottom-line difference between Donald Trump and Barack Obama, regarding US national security policies, turns out to be their different respective estimations of the biggest danger threatening the maintenance of the US dollar as the world’s leading or reserve currency. This has been the overriding foreign-policy concern for both Presidents.
http://www.zerohedge.com/news/2018-08-12/real-reason-why-trump-cancelled-iran-deal?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+zerohedge%2Ffeed+%28zero+hedge+-+on+a+long+enough+timeline%2C+the+survival+rate+for+everyone+drops+to+zero%29

Realist - Everybody in America is soft, and hates conflict. The cure for this, both in politics and social life, is the same -- hardihood. Give them raw truth.