What term is used to describe relationships or transactions occurring between different states?

The term referring to relationships or transactions occurring between different states is "interstate." This term is commonly used to signify interactions or exchanges, whether they be legal, economic, or social, that take place across state lines within a nation. For example, interstate commerce involves the buying and selling of goods and services across state borders and is regulated by federal law in the United States.

"Intrastate," on the other hand, refers to activities that occur within a single state and do not involve other states. "Intradistrict" is a term that usually pertains to activities within a specific district, while "international" refers to relationships or transactions between different countries, rather than states within a country. Therefore, "interstate" is the precise term for transactions between different states.