American car manufacturers have shown no interest at all in selling small cars but have been forced to by regulators. Thus the Nova, Chevette, Cobalt, Sonic, Neon, Gremlin and other names you don't remember.
Honda and Toyota could not stop making the Civic and Corolla if they tried -- if they did stop for a year they would see people buying 3 year old cars at new prices and be shocked at the money they are leaving on the table. (Honda in particular has been trying to phase out the Fit for the CR-V but they may not have the discipline to be able to do it.)
Atom is a Chevy Nova that is being marketed as if it were a Toyota Corolla. Crap like that should be forgotten in six months, not waved around to remind you how bad it is.