It's called the honeymoon period, which lasts for a few weeks to a few months with incoming Presidents.
The acid test will come with inflation. Over 50% of Americans expect him to bring prices down.
Deporting cheap illegal labor and raising tariffs does not seem to be a sensible way to tackle inflation. Apparently many people have tried and failed to convince Trump tariffs are inflationary. It remains to be seen if he will actually implement them.
The "dark time in history" was when there was wages growth, GDP growth, unemployment was under 4%, and the stock market hit record highs. However, there are always people who want to revise history.