Since Reagan, the U.S. has been following two ideologies promoted by both political parties: neo-conservatism and neo-liberalism. Both can be seen prominently in the two previous Presidents--Bush and Obama--who promoted war and bailouts for Wall Street.
Trump was literally an outsider, a non-politician who belonged outside this establishment, and tried to challenge it through peace negotiations with various countries, border control, and restrictions in trade. But he is also part of the rich that profited from the same, which is why he considered bombing Iran and gave tax cuts to billionaires. Also, many of his appointed officials came from the same establishment or worked for the same rich.