Thomas Jefferson's main contribution was being to sole writer of the Declaration of Independence. He was also an anti-federalists who helped approve the Constitution after the Bill of Rights were made. Therefore giving us a list of unalienable rights.
Thomas Jefferson wrote the Declaration of Independence, which officially declared that the American Colonies were completely free of British authority and influence
I think the correct answer from the choices listed above is option A. One of the most important legacies of the Northwest Ordinance was that it prevented the expansion of slavery in the north of the Ohio River in the newterritories. Hope this answers the question.
Most had psychiatric symptoms, these ranged from difficulty sleeping to vivid flashbacks, and are now recognized as Post Traumatic Stress Disorder (PTSD).