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A
Ended World War I
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B
Freed enslaved people in the Confederate states — declared by President Lincoln on January 1, 1863
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C
Gave women the right to vote
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D
Established the income tax
Why this is the answer
The EMANCIPATION PROCLAMATION (1863) freed enslaved people in the Confederate (rebel) states. USCIS Question 74 (65/20 list): 'What did the Emancipation Proclamation do?' — Accepted answers: freed the slaves; freed slaves in the Confederacy; freed slaves in the Confederate states; freed slaves in most Southern states. Note: It did not free slaves in the Border States that remained in the Union; the 13th Amendment (1865) abolished slavery throughout the entire United States. Lincoln issued it as a war measure and a moral turning point of the Civil War.
Source: USCIS Civics Question 74 (65/20) — Emancipation Proclamation