As the United States prepares to celebrate Independence Day, we look at why July 4 is not a cause for celebration for all. For Native Americans, it may be a bitter reminder of colonialism, which brought fatal diseases, cultural hegemony and genocide. Neither did the new republic’s promise of "life, liberty and the pursuit of happiness" extend to African Americans. The colonists who declared their freedom from England did not share their newly founded liberation with the millions of Africans they had captured and forced into slavery. We speak with historian Gerald Horne, who argues the so-called Revolutionary War was actually a conservative effort by American colonists to protect their system of slavery.