I know the situation in the Us is rather more complex than for example in member states of the EU (not all countries in Europe are in the EU).........because there is a mix of Federal and State legislation. That leads to as many problems as it solves since whilst you have the Class 1 regulation which is essentially the same as the "Pedelec" regulation in the EU you also have Classes 2 and 3.............that leads to ALL ebikes, even the Class 1 bikes being prevented from using some "mtb" venues/trails, in some states. If you do a check you will find restrictions on the use of Ebikes in most countries. Some follow most of the "pedelec" regulations ( UK, Australia/New Zealand, Norway, Switzerland etc) some in Asia are even more restrictive.
To be clear in those countries following the "pedelec" regulations a Pedelec is classed as a bicycle and therefore allowed anywhere a normal bicycle is allowed. Ebikes not following the pedelec regulations in the UK ( and many other countries) are mopeds not bicycles.........and all the regulations that apply to Mopeds apply to them........registration, insurance, type approval, lights, horn, wearing of helmet. They can only be ridden on public roads or private land with no public access.
At the end of the day, on this forum we are mainly talking about EMTBs designed and supplied by Specialized, Giant, Trek, Whyte, Orbea , YT, SantaCruz etc. Their products are Pedelecs/Class 1 bikes a ble to be sold for MTB in the majority of the markets they serve, with the maximum assisted speed the only variable ( 20kph/25kph being the main variations)
The DJI/Amflow is also a Pedelec/Class 1.