Fugitive state law required northern in returning what

In response to the weakening of the original fugitive slave act, the Fugitive Slave Law of 1850 penalized officials who did not arrest an alleged runaway slave, and made them liable to a fine of $1,000 (about $29,000 in present-day value). Law-enforcement officials everywhere were required to arrest people suspected of being a runaway slave on as little as a claimant's sworn testimony of ownership. The suspected slave could not ask for a jury trial or testify on his or her own behalf.[6]In addition, any person aiding a runaway slave by providing food or shelter was subject to six months' imprisonment and a $1,000 fine. Officers who captured a fugitive slave were entitled to a bonus or promotion for their work.

(RUN AWAY SLAVES is the answer)

 Probably 1700s

This would be in the century after LaSalle claimed all the lands drained by the Mississippi River in 1682.

Explanation:  I say "probably" because this colonization by Germans is not well-documented in the publications of the Oklahoma Historical Society or  the Encyclopedia of Oklahoma History. So I wonder where this question comes from.

One reference in an article about the Heavener Runestone State Park says, "Others contend that the inscriptions were made by a member of La Salle's expedition party circa 1687, or by a Swedish captain leading German colonists as part of a French colonization effort in the Mississippi Valley between 1718 and 1720."

Other articles mention of Spanish settlement in areas claimed by France.