If you stay longer in the United States than allowed, you should know that this may have serious consequences. Those visitors who overstay, may be barred from visiting the US for a period of three to ten years, depending on how long the illegal stay is.
Visitors who are refused entry at the border, may be barred from visiting the US for a period of five to twenty years.
Please note that US Immigration and Naturalization Officials have to respect the rules and regulations of the US Immigration Laws and that it is their job to prevent illegal immigration. A visitor who is denied entry in the US, will be detained at the border or in the airport of entry and will be deported to his/her home country.