Is the Declaration of Independence biased?

No because it only was for white men right

One obvious form of bias is that although it admitted that "all people are endowed with certain Rights by their Creator, among them Life, Liberty and the Pursuit of Happiness", slaves were still widely used and treated inhumanely until almost 200 years after the Declaration was written. This went the same with women, although they were treated unfairly to a lesser degree compared to slaves.