the _duty_; if they confer constitutional _authority_, they create
constitutional _obligation_. If Congress _may_ abolish because of an
expression of their will, it _must_ abolish at the bidding of that will.
If the people of the District are a _source of power_ to Congress, their
_expressed will_ has the force of a constitutional provision, and has
the same binding power upon the National Legislature. To make Congress
dependent on the District for authority, is to make it a _subject_ of
its authority, restraining the exercise of its own discretion, and
sinking it into a mere organ of the District's will. We proceed to
another objection.

"_The southern states would not have ratified the constitution, if they
had supposed that it gave this power_." It is a sufficient answer to
this objection, that the northern states would not have ratified it, if
they had supposed that it _withheld_ the power. If "suppositions" are to
take the place of the constitution--coming from both sides, they
neutralize each other. To argue a constitutional question by _guessing_
at the "suppositions" that might have been made by the parties to it
would find small favor in a court of law. But even a desperate shift is
some easement when sorely pushed. If this question is to be settled by
"suppositions," suppositions shall be forthcoming, and that
without stint.

First, then, I affirm that the North ratified the constitution,
"supposing" that slavery had begun to wax old, and would speedily vanish
away, and especially that the abolition of the slave trade, which by the
constitution was to be surrendered to Congress after twenty years, would
plunge it headlong.

Would the North have adopted the constitution, giving three-fifths of