Which president expanded the New Frontier into the Great Society?

Lyndon B. Johnson expanded the New Frontier into the Great Society following the assassination of John F. Kennedy. Johnson, who served as vice president under Kennedy, embraced the vision of his predecessor while also introducing significant initiatives of his own. The Great Society was a set of domestic programs aimed at eliminating poverty and racial injustice, with initiatives that included Medicare, Medicaid, and the establishment of various educational and environmental programs. The expansion of the New Frontier into the Great Society represented Johnson's commitment to enhance the social safety net and promote civil rights, building on the foundations laid by Kennedy but pushing the agenda further in a more ambitious scope.