There definitely could be ways that the Trump legacy could continue in a legal manner.
You don't need to come here to understand the system, you just need to start studying it. If you want to study it the best place to start is from the beginning--the founding period and how things came to be--and what the founders actually established. The best source for that info is the debates of the Philadelphia convention of 1787, the federalist, and anti-federalist papers, and the Virginia State convention of 1788 on ratification. Then study the Constitution itself. Also, it's important to understand the Virginia and Kentucky resolutions of 1798. Anyone who has studied all this in a thorough manner will know more than 99% of University grads, and probably 95% of congress.
If you want to learn the culture/s, first, you must know that there is no single American culture. Each State is different from the next, and then within States you have small subcultures. The US isn't one giant nation like outsiders think it is. Granted, you have large sections that are similar, but if you travelled to all 50 States you would notice vast differences amongst the people as you travelled. On the surface this isn't detectable except between the larger sections--New England, The North, The South, The deep South, The Midwest, The Northwest, The interior Northwest, The West, and the South West--these are the larger regions which are all distinct from each other, but there are many subcultures in each of these areas.
I would propose that the only reason you think it unimaginable that Trump got in is due to the sources you follow which continually exaggerate and lie about Trump and his administration. Just like those who worship Trump follow sources which do the same. I'm not a supporter of either side in this debate. If you understand the system, and you have a good foundation on how the US system works, and you have a good understanding of the history of the US, and its many executives, you'll realise that Trump isn't much better or worse than any other president of the past 100 years. He's not as insane as the left makes him appear, and he's not as good as the right makes him appear. Don't get so emotionally involved and step back to consider what actually is, not what is being made to appear to be. Each side has his or her partisan hacks who spin the truth to fit their narrative.