2. president lincoln abolished slavery when he issued the emancipation proclamation in 1863, this meant that slavery could continue in the united states.

If this is a true/false question, it's tricky.  It's essentially true, because Lincoln's proclamation did not outlaw slavery in states that were loyal to the Union.  The proclamation, at the time it was issued, applied to slaves in states that were in rebellion against the Union.

Historical context/details:

President Abraham Lincoln issued The Emancipation Proclamation as an executive order on January 1, 1863. The executive order declared freedom for slaves in  ten Confederate states in rebellion against the Union.  It also allowed that freed slaves could join the Union Army to fight for the cause of reuniting the nation and ending slavery.  As summarized by the Historical Society of Pennsylvania, "The Proclamation broadened the goals of the Union war effort; it made the eradication of slavery into an explicit Union goal, in addition to the reuniting of the country."

While Lincoln personally was strongly against slavery, he had to tread carefully in his role as president and commander-in-chief.  The Emancipation Proclamation was carefully worded in order to retain the support of four border slave states, which remained in the Union though they were states that permitted slavery, were  Maryland, Missouri, Delaware, and Kentucky.   Lincoln wanted to keep those states loyal to the Union cause.

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