The Constitution and political system

The quote that stood out to me was  "The power of Congress to make all laws that are necessary and proper to regulate commerce among the several states, or with foreign nations, shall not be construed to include the power to regulate or prohibit any activity that is confined within a single state regardless of its effects outside the state, whether it employs instrumentalities therefrom, or whether its regulation or prohibition is part of a comprehensive regulatory scheme; but Congress shall have power to regulate harmful emissions between one state and another, and to define and provide for punishment of offenses constituting acts of war or violent insurrection against the United States." This gave me an understanding that the congress is in charge of what happens and makes any necessary precautions to do so. . The forms and regulations of foreign nations have to be met.