Why did president Johnson announce he would not seek another term?

President Lyndon B. Johnson announced he would not seek another term in March 1968 primarily due to the escalating unpopularity of the Vietnam War, which had led to widespread protests and division within the country. His administration faced significant criticism over its handling of the conflict, which overshadowed his domestic achievements. Additionally, Johnson's declining approval ratings and personal toll from the pressures of the presidency influenced his decision to step back from the race.