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The Declaration of Independence is a statement that declared that the 13 colonies were independent states and no longer under British rule. The Declaration of Independence is a symbol that the citizens of U.S. are equal and eligible to certain absolute rights for example, life and liberty. On other hand, the Constitution of U.S. is the foundation of the government. It is the supreme law of the country. The Declaration of Independence took place first on July 4, 1776 while the Constitution was written on 1787. It was importance for Declaration of Independence to occur first because individuals make goods laws that will govern them when they are free.

Both the U.S. Constitution and Thomas Jefferson's Letter to the Danbury Baptists in 1802 enhances unity among the American people. The letter was meant to assure Danbury Baptist Association that the legislature had no intention of interfering with the freedom of worship as it was stipulated in the constitution.

The Declaration of Independence was a sign that the all the citizens are equal and entitled to certain inalienable rights including life and liberty. Thomas Jefferson's Letter to the Danbury Baptists in 1802 has the same purpose of ensuring that the government does not act in a way that the rights of citizens will be violated. This is what the letter contained "I contemplate with sovereign reverence that act of the whole American people which declared that their legislature should 'make no law respecting an establishment of religion, prohibiting the free exercise thereof,' thus building a wall of separation between church and State."