Yes he did. Because of his proposal things heated up in Congress over slavery. He was very much apposed to slavery and dishearted with Congress over this he left.
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Ban slavery in any territory acquired from Mexico in the Mexican War or in the future, and possibly disputed lands in south Texas and New Mexico.
Keep slavery out of newly acquired Mexican territory
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Douglas proposed that the people within each new territory should decide the slavery question for themselves without regard to the rest of the country, known as Popular Sovereignty.
As a matter of fact, that was William Nye sometimes dubbed as "The Science President"