Why did John Adams not serve a second term as President?

John Adams did not serve a second term as President primarily due to the political divisions and unpopularity stemming from his administration's decisions, particularly the Alien and Sedition Acts. His foreign policy, especially the Quasi-War with France, also alienated many voters. In the 1800 election, he was defeated by Thomas Jefferson, reflecting the growing support for the Democratic-Republican Party over the Federalists. Additionally, Adams' reluctance to engage in partisanship further weakened his political standing.