WHY would some people feel that the 4th of July was NOT a day of freedom for them?

Basically Douglas said that slaves did not care about America and showed the curial world  

Explanation:

on this day in 1913, henry ford installs the first moving assembly line for the mass production of an entire automobile. his innovation reduced the time it took to build a car from more than 12 hours to two hours and 30 minutes.

answer; i believe the correct answer is (desert storm);