The definition of a graph is a diagram showing the relationships between two or more things. An example of graph is a pie chart. Graph is defined as to create a diagram that shows a relationship between two or more things. An example of graph is to create a series of bars on graphing paper.
President Abraham Lincoln - Slavery Abolished: On September 22, 1862 President Abraham Lincoln, United States of America, took the first step to abolish slavery Home President Abraham Lincoln - Slavery Abolished On Sept. 22, 1862, United States of America  issued the preliminary Emancipation Proclamation, declaring all slaves in rebel states should be free as of Jan. 1, 1863.
(on Archives.gov) Passed by Congress on January 31, 1865, and ratified on December 6, 1865, the 13th amendment abolished slavery in the United States. The 13th amendment, which formally abolished slavery in the United States, passed the Senate on April 8, 1864, and the House on January 31, 1865. On February 1, 1865, President Abraham Lincoln approved the Joint Resolution of Congress submitting the proposed amendment to the state legislatures.