The United States had states before the secession when 11 Southern states withdrew
to form the Confederacy.

True. It did have states then. It has states now, too.

Explanation:

concurrent jurisdiction is the ability to exercise judicial review by different courts at the same time, within the same territory, and over the same subject matter. for instance, a domestic violence matter may be heard in either a general civil court or a family court in the same county. whichever court actually exercises its jurisdiction first will do so exclusively.

answer; when one group has an extremely high score at pretest;