" Extend the sphere," Madison wrote, and, "you take in a greater variety of parties and interests," and you make it difficult for either a mob majority or a tyrannical minority to unite "to invade the rights of other citizens."

Whatever one's take on any of the debates of the day (especially the debate over slavery), and whatever one's philosophical understanding of the relationship of republicanism to land, commerce, finance, and labor, most agreed on practicalities. Also wanted to remove Spain from the Mississippi; also wanted the capacities to pacify hostile native Americans and put down rebellions of poor people; and all wanted Great Britain to get out of the way of their commerce.

All wanted "room enough," as Thomas Jefferson would put it in his 1800 inaugural address, to be protected from Europe's "exterminating havoc."

Expansion became the answer to every question, the solution to all problems, especially those two caused by expansion. "

― Greg Grandin , The End of the Myth: From the Frontier to the Border Wall in the Mind of America