From Infidel753:
Trump is restructuring the democratic world, though in ways not congruent with his intentions, and the changes will go deeper the longer he remains in office. He evidently believes that the power of the US enables it (well, him) to simply make demands on other countries and compel them to obey. Combined with his ignorance about the world, this belief produces a pattern of erratic and alarming behavior which is eroding the leadership role the US has held since the end of World War II.
His early comments calling into question the US defense commitments to the democracies of Europe and East Asia must have set off alarm bells for the governments of those countries, and no doubt quite a few very sober high-level meetings took place in Tokyo, Berlin, Paris, etc. around that time. The “axis of adults” in Washington eventually persuaded Trump to back down from some of his stupidest remarks, but his true attitude had been revealed, and other governments knew that they couldn’t count on the “adults” to remain in place (indeed, all are now gone except Mattis).
Since then Trump has further damaged the US leadership role with such moves as withdrawing from the Paris climate accord, after which other countries (and even some US states and cities) simply went on following the accord without him. His threats of trade war prompted Europe, not to submit, but to announce plans for retaliation. No other major country has emulated his pointless and inflammatory gesture of moving the US embassy in Israel to Jerusalem. His abandonment of the Iran nuclear deal reeked of arrogance, with his new ambassador to Germany imperiously ordering the world’s fourth-largest economic power to slavishly fall into line.