Final answer:
President John F. Kennedy called for a "New Frontier" and encouraged college students to join the Peace Corps as part of his efforts to advance U.S. interests and promote democracy during the Cold War.
Step-by-step explanation:
The president who called for a "New Frontier" and asked college students to join the Peace Corps to spread democratic ideology and technical skills was John F. Kennedy. Kennedy's New Frontier aimed to ignite a pioneer spirit among Americans, encouraging them to participate in activities like the Peace Corps, which sent idealistic Americans to provide services to third world countries. The Peace Corps became a significant part of U.S. foreign policy, counteracting Soviet influence and promoting U.S. democratic values during the Cold War. Kennedy's domestic policies also encompassed proposals such as raising the minimum wage, funding education, and supporting civil rights, although some of these faced significant obstacles in a conservative Congress.