It is true, indeed, that the national domain is ours. It is true that it was acquired by the valor and with the wealth of the whole nation. But we hold no arbitrary authority over it. We hold no arbitrary authority over anything, whether lawfully acquired or seized by usurpation. The constitution regulates our stewardship; the constitution devotes the domain to union, to justice, to defense, to welfare and to liberty.
But there is a higher law than the Constitution, which regulates our authority over the domain, and devotes it to the same noble purposes.
Speech, United States Senate (11 March 1850).