What caused Jefferson and his party to change their approach to governing

The presidential campaign of 1800 that pitted Jefferson and Aaron burr against John Adams and Charles cotesworth was bitterly consented

There was a fear of a civil war between Federalists and anti-Federalists on the Election of 1800. If Jefferson changed his beliefs that there's a triumph within the "Strongest government of the Earth", and tried to unite all Americans regardless of political belief, he would not only put freedom at sake, but he would unite a whole country.