The men who signed the Declaration affirmed that all men were created equal, but who were the men they were referring to? They knew that not all men were equal in intelligence and that some men were bigger, stronger and faster than others, they all had the same rights and responsibilities.
The signers considered slaves to be property and were not entitled to the same rights as their owners. Native Americans and women were not equal with white men as they could not vote, own property, hold electives offices or serve on juries.
Natural rights have always existed and cannot be altered, amended or abolished. While the Declaration of Independence can be interpreted differently, the laws of nature can not.The law of gravity is a natural law and so is the principle of equality under the law.