Our constitutional history started with the States retaining all powers of sovereignty unimpaired, save those conferred upon the National Government.… - Calvin Coolidge

All native-born Americans, directly or indirectly, have the advantage of our schools, our colleges, and our religious bodies. It is our belief that America could not otherwise exist. Faith in mankind is in no wise inconsistent with a requirement for trained citizenship, both for men and women. No civilization can exist without a background—an active community of interest, a common aspiration—spiritual, social, and economic. It is a duty our country owes itself to require of all those aliens who come here that they have a background not inconsistent with American institutions.

Our generation has recently lived through times still so vivid as to seem but as yesterday, which have taught us deeply to appreciate the value of union in purpose and effort. We have come to see as through a crystal that in the national variety of talents and resources, of cultures and capacities, of climates and of soils, of occupations and of interests, lies the guaranty of both our power and our authority. More than that, they have taught us how heavy and important is our responsibility in the world.

Practically all the civil and military authorities of the government, except the Congress and the courts, hold their office at [the President's] discretion. He appoints, and he can remove. The billions of dollars of government revenue are collected and expended under his direction. The Congress makes the laws, but it is the President who causes them to be executed. A power so vast in its implications has never been conferred upon any ruling sovereign. Yet the President exercises his authority in accordance with the Constitution and the law. He is truly the agent of the people, performing such functions as they have entrusted to him.