Most e-bikes and motors are made in China I'm afraid to say, but on the good side is that China also make some of the good quality hub motors also.
You get what you pay for. Take the scooter for a ride before you buy and go directly to a hill to climb, this will instantly tell you lots about the bike.
Avoid scooters that are under $700, you will end up buying "land fill" then your still without a bike, and broke.

Often the best deal is to convert a comfortable bike and retrofit the hub motor and batteriy to fit. Some bike stores will do this for you.

edit: for better english