Question: When was the emancipation proclamation signed into law?
Disambiguated questions and answers: question: When was Lincoln's preliminary warning related to the emancipation proclamation made?
When was the emancipation proclamation signed into law and took effect?
answer: September 22, 1862
January 1, 1863
Natural Questions answer: 22 September 1862 (from the Wikipedia article "Emancipation Proclamation")