Johnson, Lyndon B.
(1908-73) a US politician in the Democratic Party who was the President of the US from 1963 to 1969. He first became president when President Kennedy was killed in 1963, and was elected again in 1964. He then started his plan for a 'Great Society' by introducing laws that helped poor people, improved medical care and education, and gave civil rights to all US citizens whatever their race. When the US became more involved in the Vietnam War, however, he became unpopular.