What you say about the 1990s simply means that today's conservatives are yesterday's progressives. That's to be expected. In 1925, they'd want to go back to the 1890s.

The tribal conflict between two parties is unique to the US. You don't see that in Commonwealth countries which have a similar voting system.

There is bitterness between the left and the right across the world, probably due to the media and social media environment, but I don't see much of a gap in actual policies. In Europe, there have been social-democratic governments limiting immigration and conservative nationalists expanding the welfare state.