Lincoln had begun pressuring the Border States to abolish slavery in November, 1861, with no success. In 1862 he began to warn the states that if they did not abolish slavery on their own, the institution would succumb to the "incidents of war" and would be undermined by "mere friction and abrasion." But the abrasive was no mere incident; it was the policy of emancipation. Beginning in mid-1863 Lincoln intensified the pressure on all the slave states, and in early 1864 the policy began to pay off. Between January, 1864, and January, 1865, three slave states abolished slavery, all under intense pressure from the federal government. By the time the House of Representatives sent the Thirteenth Amendment to the states for ratification the ratio of free to slave states was 27: 9, or three-quarters.