Colin Kaepernick issued a fierce rebuke of Independence Day, slamming the 'celebration of white supremacy' and calling out America for 'centuries' of abuse against black people.'Black ppl have been dehumanized, brutalized, criminalized + terrorized by America for centuries, & are expected to join your commemoration of 'independence', while you enslaved our ancestors,' Kaepernick said in his tweet. 'We reject your celebration of white supremacy & look forward to liberation for all.