In what ways has the struggle for freedom, equality and the pursuit of happiness changed
with time? Or has it changed at all? Think
about the "What to the Slave is the Fourth of
July speech and the struggles Frederick
Douglass faced. What, if anything, is different?

It hasn't changed because the struggle for freedom equality and pursuit of happiness has gotten worse. As we have in this last century people are protesting for black lives matter meaning that we have a right to life as anyone else.

The answer above is wrong. The correct answer is: It contains a negative connotation because when something is contaminated, it contains a harmful substance.