But a constitutional amendment has to be ratified by three-fourths of the states. There were too many slave states and not enough free states for a constitutional amendment to be ratified, so even as he was preparing to issue his Emancipation Proclamation he proposed a series of constitutional amendments that would make it easier for the federal government to pressure states to abolish slavery on their own, including compensation, a gradual timetable for abolition, and subsidies for blacks willing to colonize themselves outside the United States. None of those constitutional amendments came close to passage. But by 1863 Lincoln had other ways of pressuring the state to abolish slavery: By refusing to return slaves who escaped from loyal masters in loyal states, and by enlisting slaves from loyal states into the Union Army with the promise of emancipation, the Lincoln administration systematically undermined slavery in many of the southern states.