21 Acronym for clause which guarantees that marriage licenses will be accepted in
other states

It’s a four letter word

Full Faith and Credit Clause (FFCC).

Explanation:

Full Faith and Credit Clause (FFCC) is a clause which guarantees that marriage licenses will be accepted in other states.

Basically, the Full Faith and Credit Clause (FFCC) states that, any judicial decision (judgment or verdict) rendered by a court of competent jurisdiction in one state shall be recognized, accepted and honored in other states in the United States of America.

The Full Faith and Credit Clause (FFCC) is found in Article IV, Section 1 of the United States Constitution.

the answer is migration

1. temperance, abolitionist, suffragist