Just out of curiosity: This is very uncommon in modern democracies, isn't it?
In most European countries (and maybe also in the US?) each newly elected government shows enough respect for the previous government by not reversing laws established just 1-3 years ago. They usually either concentrate on different topics, or restrict themselves to refinements and corrections of existing laws.
And there's some good reason for that: You don't want a country's set of laws switching between two versions every 4-5 years without making any progress.
However, since that taboo has been broken by now, maybe the next US president would have the courage to do the same with everything the current president did?