Pat basically ran on Trump's platform (albeit with vastly different style and rhetoric) but 20yr before anyone wanted to vote for it. It was the 90s. The world was a happy fun place free of the USSR. Why wouldn't the US want to be involved in the world? Why wouldn't the US want to do the maximal amount of trade with everyone. Optimism abounded. Isolationism and pragmatic "we'll serve ourselves fist" policy doesn't do well when everyone is feeling optimistic.
I expect to see a resurgence in isolationist policy in the near future because the world is seen as a crappy place now. China and Russia are widely viewed as threats we need to hedge against and the middle east is widely viewed as a source of inextricable quagmires and nothing good. People are not happy about how things are at home. Regardless of the balance of power between the parties and which parties own which branches there is a lot more looking inward in the near future.
I expect to see a resurgence in isolationist policy in the near future because the world is seen as a crappy place now. China and Russia are widely viewed as threats we need to hedge against and the middle east is widely viewed as a source of inextricable quagmires and nothing good. People are not happy about how things are at home. Regardless of the balance of power between the parties and which parties own which branches there is a lot more looking inward in the near future.