The law of nature is absolute law or norm of good and evil, exists in the nature, and manages all human beings anytime, anywhere like physical laws such as gravity. John Locke equates natural laws with human reasons. In other words, the laws of nature are understandable and provide a measure of our behavior. In the creation of the country, the natural law was deeply rooted in Thomas Jefferson's so-called "American thought". When the founder of the United States declared independence from England in 1776, they rely on the law of nature and the god of nature. Also based on this law the founder advocated the idea of Republican autonomy and believed that justice would result from the protection of natural rights.
"The goal of the government will be attained if public security is provided, freedom and property are protected, justice is managed, virtue is encouraged, oppression opposed, and the true interests of the state are promoted."
Some founder criticized slave trade because it infringes on natural rights. In the draft of the Declaration of Independence, Thomas Jefferson attacked slave trade in harsh words and said it as "a cruel war against human beings itself, infringing its most sacred right to the lives and freedoms of distant people I called it. " In response to these views, it is said that slave trade continues to "ignore the most sacred laws of mankind" (James Madison, Federal Congress, 1787).
In 1806, President Thomas Jefferson accused international slave trade and called for a law to criminalize it. In his 1806 message, he told Congress, "I mentioned that such a law is necessary to allow American citizens to stop participating in human rights violations." Prohibited "Congress announced the prohibition of international slave trade in 1807, effective January 1, 1808. As a result, the amount of slave trade from Africa to the United States has decreased by over 90%. About 1,000 slaves are illegally brought to the United States every year.