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c. 1865 photograph
John·son(jŏn′sən), Andrew 1808-1875.
The 17th president of the United States (1865-1869). Elected vice president (1864), he succeeded the assassinated Abraham Lincoln as president. His administration was marked by reconstruction policies in the South and the purchase of Alaska (1867). An attempt to unseat Secretary of War Edwin Stanton led to Johnson's impeachment on purely political charges brought by Republican senators (1868). Johnson was acquitted by one vote.