When the Declaration was written in 1776 by Thomas Jefferson, Benjamin Franklin and John Adams, the founding fathers wanted to legitimate the constitution. The Declaration considers Americans as a whole instead of members of separated colonies, and each one is a particular individual.
So, when Declaration considered equal to all men and women, part of God's creation, "with certain unalienable Rights like Life, Liberty and the pursuit of Happiness", it implied that humans must be free to think, decide and move as their own necessities, showing respect for his fellow beings-
Originally, it included everyone. Unfurtanely, nowadays we see a different picture as it is related in the news.
Conflicts between black people with white people, violent police acts against people from other races, hatred from political parties to immigrants and other forms or inequity.