The American Martingale is a linear progression where the stake is raised only by one unit (chip) after a lost bet. That makes it impossible to compensate fully for your losses after having raised your stake twice. You can only expect a profit if the game series is shorter than a 1000 games and if there is no series of losses over more than 10 bets.
Table for the American Martingale
Bets are on Black
The American Martingale should be seen as a variant of the Martingale which is less useful, but which can be used in combination with other roulette game systems.