Statistics for occurrence #1 of “President Lincoln” in entry abolition of Harper's Encyclopedia of United States History:
...y statute, and in 1850 slavery as an institution had practically disappeared from them.
Slavery was finally abolished from all the territory of the United States by the Emancipation Proclamation of President Lincoln and the adoption of the Thirteenth Amendment to the national Constitution, in 1863-65.
See Constitution of the United States; emancipation proclamations.
...