Interstate and Widespread

Interstate adjective - Involving and relating to the mutual relations of states especially of the United States.

Widespread and interstate are semantically related in national topic. In some cases you can use "Widespread" instead an adjective "Interstate", when it comes to topics like nationwide, concerning a country with a.

Widespread adjective - Having considerable extent.

Interstate and widespread are semantically related in national topic. You can use "Interstate" instead an adjective "Widespread", if it concerns topics such as nationwide.