True freedom is an inward state of being. Once it is attained, no situation in the world can bind one or limit one's freedom.
To judge by what my children are learning in school, you'd think American history was 75 percent slavery and 25 percent everything else (and that 25 percent includes a large dollop of imperialism, racism, sexism and homophobia, leaving little time for Lincoln, Edison, Clay, Holmes, Alcott, Dickinson, Adams, Longfellow or Fulton).