160 YEARS AGO: The question of submitting to the States a proposition to amend the Federal Constitution in order to abolish slavery throughout the Union, has, as our readers are aware, passed the Senate by the requisite two-thirds vote and is now before the House of Representatives. The Republicans support the measure to a man; most of the Democrats oppose it—not because they care to perpetuate slavery, but because they doubt the policy and good effect on the country of…