"If the Creator had separated Texas from the Union by mountain barriers, the Alps or the Andes, there might be plausible objections; but He has planed down the whole [Mississippi] Valley including Texas, and united every atom of the soil and every drop of the water of the mighty whole. He has linked their rivers with the great Mississippi, and marked and united the whole for the dominion of one government, the residence of one people."

This quotation from the 1840's can be viewed as an expression of:
A the New Nationalism
B popular sovereignty
C Manifest Destiny
D the Good Neighbor policy
E the frontier thesis