a slave brought into the state and kept _there a year_, was _free_. The
Maryland Court of Appeals at the December term 1813 [case of Stewart
_vs._ Oakes,] decided that a slave owned in Maryland, and sent by his
master into Virginia to work at different periods, making one year in
the whole, became _free_, being _emancipated_ by the law of Virginia
quoted above. North Carolina and Georgia in their acts of cession,
transferring to the United States the territory now constituting the
States of Tennessee, Alabama and Mississippi, made it a condition of the
grant, that the provisions of the ordinance of '87, should be secured to
the inhabitants _with the exception of the sixth article which prohibits
slavery_; thus conceding, both the competency of law to abolish slavery,
and the power of Congress to do it, within its jurisdiction. (These acts
show the prevalent belief at that time, in the slaveholding States, that
the general government had adopted a line of policy aiming at the
exclusion of slavery from the entire territory of the United States, not
included within the original States, and that this policy would be
pursued unless prevented by specific and formal stipulation.)

Slaveholding states have asserted this power _in their judicial
decisions_. In numerous cases their highest courts have decided that if
the legal owner of slaves takes them into those States where slavery has
been abolished either by law or by the constitution, such removal
emancipates them, such law or constitution abolishing their slavery.
This principle is asserted in the decision of the Supreme Court of
Louisiana, in the case of Lunsford _vs._ Coquillon, 14 Martin's La.
Reps. 401. Also by the Supreme Court of Virginia, in the case of Hunter
_vs._ Fulcher, 1 Leigh's Reps. 172. The same doctrine was laid down by
Judge Washington, of the United States Supreme Court, in the case of
Butler _vs._ Hopper, Washington's Circuit Court Reps. 508. This
principle was also decided by the Court of Appeals in Kentucky; case of
Rankin _vs._ Lydia, 2 Marshall's Reps. 407; see also, Wilson _vs._
Isbell, 5 Call's Reps. 425, Spotts _vs._ Gillespie, 6 Randolph's Reps.
566. The State _vs._ Lasselle, 1 Blackford's Reps. 60, Marie Louise
_vs._ Mariot, 8 La. Reps. 475. In this case, which was tried in 1836,
the slave had been taken by her master to France and brought back; Judge
Mathews, of the Supreme Court of Louisiana, decided that "residence for
one moment" under the