That is what I saw for leverage as well, but what about selling short?
Binance.us does not support any form of trading other than SPOT.
Its not possible to sell short without margin or leverage because to go short, you need to sell coins that you do not own - borrow them using collateral (margin) or use futures (what is also not supported on binance.us and every other broker/exchange that does not want to be chased by USA like bitmex was)