Canada, Free, and History: HİSTORY$ @HISTORY , 12 feb.
 Slaveholders knew that enslaved people were escaping to Mexico, and the
 U.S. tried to get Mexico to sign a fugitive slave treaty. But Mexico refused to
 sign such a treaty, insisting that all enslaved people were free when they set
 foot on Mexican soil
 The Little-Known Underground Railroad That Ran South to Mexico
 The Underground Railroad ran south as well as north. For slaves in
 Texas, refuge in Canada must have seemed impossibly far away.