National Review by Victor Davis Hanson 1/2/2018
Most new administrations do not really completely overturn their predecessors’ policies to enact often-promised ideologically driven change.
The 18-year span of Harry Truman to Dwight Eisenhower to John F. Kennedy was mostly a continuum from center-left to center-right, back to center-left. Kennedy was probably as hawkish and as much of a tax cutter as was Eisenhower.
The seven years of Jerry Ford to Jimmy Carter were a similar transition — or even the twelve years of George H. W. Bush to Bill Clinton. The deck chairs changed, but the ship sailed in mostly the same manner to mostly the same direction.
Even the supposed great divide of 1981 did not mean that Jimmy Carter had been as left-wing as Ronald Reagan was right-wing. Carter’s fight against inflation and renewed defense build-up was continued in part by Reagan. George W. Bush was not as markedly right-wing as Barack Obama was clearly left-wing. In sum, there have rarely been back-to-back complete reversals in presidential agendas.
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http://www.nationalreview.com/article/455051/trump-obama-compare-results