Interstate (adjective)

1. Located or taking place between or among states; relating to or connecting different states.
2. Of, or relating to, the federal system of highways connecting the states of the US.

Origin:

Mid 20th century: from inter- + state, probably on the pattern of french inter-état.

Examples:

1. An interstate agreement was reached between the two states on how to manage the shared resources.
2. The interstate highway system was a vast network of roads spanning the country.
3. The commerce between the states was facilitated by the construction of the interstate roads.
4. The interstate train service provided a convenient way to travel between cities in different states.
5. The high-speed interstate flight linked major cities in the country in a matter of hours.