The significance of the Declaration of Independence regarding equality primarily lies in its assertion that "all men are created equal." This phrase established the foundational principle of equality in the context of human rights and governance, emphasizing that every individual has inherent rights that are not granted by any government. While the Declaration did not fully apply this ideal to all groups in society at the time, it set the stage for future movements advocating for the rights of all people, including women and enslaved individuals. Thus, the correct answer is:
• It established the foundation that all men were created equal.