Why was important for johnson to be elected president

Andrew Johnson (1808-1875), the 17th U.S. president, assumed office after the assassination of Abraham Lincoln (1809-1865). Johnson, who served from 1865 to 1869, was the first American president to be impeached. A tailor before he entered politics, Johnson grew up poor and lacked a formal education. He served in the Tennessee legislature and U.S. Congress, and was governor of Tennessee. A Democrat, he championed populist measures and supported states’ rights. During the U.S. Civil War (1861-1865), Johnson was the only Southern senator to remain loyal to the Union. Six weeks after Johnson was inaugurated as U.S. vice president in 1865, Lincoln was murdered. As president, Johnson took a moderate approach to restoring the South to the Union, and clashed with Radical Republicans. In 1868, he was impeached by Congress, but he was not removed from office. He did not run for a second presidential term.

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.