You shouldn't put so much blame on Trump himself. What the USA does on the international stage is mostly decided by other people. The president is just the face of it all and always gets to have like one big campaign to show for himself. Bush had his War on Terror, Obama had Obamacare and Trump has his MAGA slogan which will transcribe into something eventually but we haven't yet seen what maybe a wall on the Mexican border, maybe something else.

TLDR: It would probably have been the same with any other of the candidates becoming president.