Federal law does not require breaks. Period. While there are rules the employer has to follow under Federal law if they choose to offer breaks, as far as Federal law is concerned it is entirely up to the employer whether or not to offer them and if so, how long and how many they offer.
Some, but by no means all, states require that all or some employees be provided with breaks. In your state, an employee who works a shift of seven and a half hours or longer is entitled to a 20 minute meal break no later than five hours into the work period. Employee who work a shift of less than seven and a half hours do not, in Illinois, have to be offered breaks.