Final answer:
John F. Kennedy's purpose was to inspire Americans to actively contribute to society, signaling a balance between domestic policies and foreign affairs under the vision of the New Frontier.
Step-by-step explanation:
President John F. Kennedy's purpose in the excerpt from his inaugural address was to emphasize the enormous power and responsibility in the hands of humanity to overcome challenges such as poverty and the threat of nuclear destruction. Kennedy sought to inspire a sense of active citizenship and collective action, urging Americans to commit themselves to public service and the betterment of society. His goal was to galvanize a nation toward a shared vision for progress and to confront the pressing global and domestic issues of the time, setting the tone for his presidency and the ambitious agenda he termed the New Frontier. The call to action entailed both a commitment to advancing American values worldwide, in particular containing the spread of communism, and tackling internal issues like poverty, signaling a balance between domestic policies and foreign affairs.