Mary Jane Christopher was 4 years old when U.S. President Abraham Lincoln issued the Emancipation Proclamation, declaring the freedom of all slaves in Confederate territory by January 1, 1863. Abraham Lincoln was an American statesman and lawyer who served as the 16th President of the United States from March 1861 until his assassination in April 1865. Lincoln led the United States through the American Civil War—its bloodiest war and perhaps its greatest moral, constitutional, and political crisis. In doing so, he preserved the Union, abolished slavery, strengthened the federal government, and modernized the economy.
Mary Jane Christopher was 21 years old when Thomas Edison demonstrates incandescent lighting to the public for the first time, in Menlo Park, New Jersey. Thomas Alva Edison was an American inventor and businessman, who has been described as America's greatest inventor. He developed many devices that greatly influenced life around the world, including the phonograph, the motion picture camera, and the long-lasting, practical electric light bulb. Dubbed "The Wizard of Menlo Park", he was one of the first inventors to apply the principles of mass production and large-scale teamwork to the process of invention, and is often credited with the creation of the first industrial research laboratory.
Mary Jane Christopher died on 1 Dec 1884 at the age of 26