And they assumed that the content of the public good would shift over time. “Constitutions of civil government,” argued Alexander Hamilton in Federalist No. 34, “are not to be framed upon a calculation of existing exigencies, but upon a combination of these with the probable exigencies of ages. . . . Nothing, therefore, can be more fallacious than to infer the extent of any power, proper to be lodged in the national government, from an estimate of its immediate necessities. There ought to be a CAPACITY to provide for future contingencies as they may happen.”