Some top sleuthing there Flecc, it is confusing here in the US. Some changes recently, I can only speak to our local situation in Virginia, Maryland & Washington, DC, in the past year both Maryland and Virginia adopted the 3-class model ebike legislation so both now permit 750w maximum, Virginia's age 14 restriction now only applies to Class 3 speed pedelecs, and the default is now Class 1 & 2 ebikes may ride on streets or paved shared-use paths where pedal bicycles are permitted unless otherwise restricted by local ordinance. The main problem for ebike riders now is the 2 states plus DC follow the Contributory Negligence liability standard in bicycle/car collisions, which is deeply unfair and allows drivers insurers to avoid paying out for injuries to vulnerable ebike riders.These 8 states permit 1000 watts:
These 4 states have minimum age limits at or above the UK's 14 years to ride an ebike:
Virginia requires compliance with motor vehicle laws when on road.