US Presidency
1880

We hold it to be an incontrovertible principle that the Government of the United States may, by means of physical force, exercised through its official agents, execute on every foot of American soil the powers and functions that belong to it. This necessarily involves the power to command obedience to its laws, and hence the power to keep the peace to that extent. This power to enforce its laws and to execute its functions in all places does not derogate from the power of the State to execute its laws at the same time and in the same places. The one does not exclude the other, except where both can not be executed at the same time. In that case the words of the Constitution itself show which is to yield. This Constitution and all laws which shall be made in pursuance thereof * * * shall be the supreme law of the land.