Divide and be ruled
Not living in the USA I am more worried about what happens at home (UK) than in the other side of the pond.
The USA is a large economy and provides a lot of tech and buys a lot of our goods -- but not all of them by a long way.
Trump will try to tie other countries up with individual trade deals, do not do what he says and he will yank the trade deal away.
If the rest of the world unites we can force Trump to behave to everyone's benefit rather than what Trump thinks is best for him personally (and the USA secondly).
Nice in theory but getting countries to act together is very hard. A few will be seduced by Trump offering trinkets - this will seem good in the short term until Trump changes it when escaping his clutches will be hard. Forward thinking is needed - something that our politician are not known for