Common law marriage is determined by the state. If a state recognizes common law marriage, the Federal government will also recognize it, as must the other states of the union. But not all states allow common law marriage. They figure if marriage is what you wanted, you’d have sprung for a license.
i have a similar question i have been with ” my husband” for 32 yrs as common law raised our children and helped each other mentally physically and financially i do not consider any one else in this manner wouldn’t this justify marriage in a common sense of the word