When I migrated to the US back in the 1990s, there were very few halal restaurants in the state of New Jersey. Oaktree Road in Iselin NJ was the only town or street where there were one or two India-Pakistani restaurants serving Halal food.
Halal means permissible. Anything that is permissible in Islam is referred as Halal. Islam like Judaism has mandated that animal for consumption be slaughtered by following certain guidelines as set by the religion.