In times of war or national emergency what freedom or founding principle has been limited or threatened

Citizens of the United States, it is clear, have a great many rights that give them freedoms all peoples hold dear: the freedom to think what they like; to voice those opinions, individually to their elected representatives or collectively in small or large assemblies; to worship as they choose or not to worship at all; to be safe from unreasonable searches of their persons, their homes, or their private papers. However, the theory of democratic government holds that along with these rights come responsibilities: to obey the laws; to pay legally imposed taxes; to serve on juries when called to do so; to be informed about issues and candidates; and to exercise the right to vote that has been won for so many through the toil and tears of their predecessors.

Another major responsibility is public service. Millions of American men and women have entered the armed forces to defend their country in times of national emergency. Millions more have served in peacetime to maintain the country's military strength. Americans, young and old alike, have joined the Peace Corps and other volunteer organizations for social service at home and abroad.