What line or lines would you cite to prove that the Emancipation Proclamation didn't actually free all the slaves in the United States? Explain.

Lincoln didn’t actually free any of the approximately 4 million men, women and children held in slavery in the United States when he signed the formal Emancipation Proclamation the following January. The document applied only to enslaved people in the Confederacy, and not to those in the border states that remained loyal to the Union.

there are no mutiple choices here

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.