This great president has never been recognized at its fair value

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1. He also gave up his career as engineer on a nuclear submarine to run that peanut farm

In 1952, Carter began an association with the US Navy's fledgling nuclear submarine program, then-led by Captain Hyman G. Rickover. Rickover's demands on his men and machines were legendary, and Carter later said that, next to his parents, Rickover was the greatest influence on his life.[10] He was sent to the Naval Reactors Branch of the Atomic Energy Commission in Washington, D.C. for three month temporary duty, while Rosalynn moved with their children to Schenectady, New York. On December 12, 1952, an accident with the experimental NRX reactor at Atomic Energy of Canada's Chalk River Laboratories caused a partial meltdown resulting in millions of liters of radioactive water flooding the reactor building's basement and leaving the reactor's core ruined.[11] Carter was ordered to Chalk River to lead a U.S. maintenance crew that joined other American and Canadian service personnel to assist in the shutdown of the reactor.[12] The painstaking process required each team member to don protective gear and be lowered individually into the reactor for a few minutes at a time, limiting their exposure to radioactivity while they disassembled the crippled reactor. During and after his presidency, Carter said that his experience at Chalk River had shaped his views on atomic energy and led him to cease development of a neutron bomb.[13]

In March 1953 he began nuclear power school, a six-month non-credit course covering nuclear power plant operation at Union College in Schenectady,[8] with the intent to eventually work aboard USS Seawolf, which was planned to be one of the first two U.S. nuclear submarines. However, Carter's father died two months before construction of Seawolf began, and Carter sought and obtained a release from active duty to enable him to take over the family peanut business. Deciding to leave Schenectady proved difficult. Settling after moving so much Rosalynn had grown comfortable with their life. Returning to small-town life in Plains seemed "a monumental step backward," she said later. On the other hand, Carter felt restricted by the rigidity of the military and yearned to assume a path more like his father's. Carter left active duty on October 9, 1953.[14][15] He served in the inactive Navy Reserve until 1961, and left the service with the rank of lieutenant.
https://en.wikipedia.org/wiki/Jimmy_Carter#Naval_career

Farming

Earl Carter died a relatively wealthy man, having also recently been elected to the Georgia House of Representatives. However, between his forgiveness of debts and the division of his wealth among heirs, his son Jimmy inherited comparatively little. For a year, Jimmy, Rosalynn, and their three sons lived in public housing in Plains; Carter is the only U.S. president to have lived in subsidized housing before he took office. Carter was knowledgeable in scientific and technological subjects, and he set out to expand the family's peanut-growing business. The transition from Navy to agribusinessman was difficult because his first-year harvest failed due to drought; Carter was compelled to open several bank lines of credit to keep the farm afloat. Meanwhile, he also took classes and read up on agriculture while Rosalynn learned accounting to manage the business's books. Though they barely broke even the first year, the Carters grew the business and became quite successful.
https://en.wikipedia.org/wiki/Jimmy_Carter#Farming