_ Several parts of the country were controlled by Spain or Native American populations. Enslaved individuals were often able to escape and find assistance at the Spanish-controlled Fort Mt. Mose in St. Augustine, Florida, or with Seminole populations in other parts of Florida. While Underground Railroad activity was concentrated mostly in the regions of the Ohio River and the Chesapeake Bay, many enslaved individuals escaped further south to the regions controlled first by Spain and later by Mexico. Though these areas saw very little Underground Railroad activity, many enslaved individuals escaped there seeking their freedom.