How did Lyndon B. Johnson's tenure end as President? A)
He was impeached due to his involvement in Vietnam
B)
He resigned as president in 1968 due to Watergate
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He chose not to seek re-election in 1968 due to his unpopularity
D)
He lost his re-election bid to Richard Nixon

Explanation:

He choose not to seek reelection because of his unpopularity.

He kept on pumping more and more troops into Viet Nam and the casualties began to mount to a breaking point for the American public. There was unrest at home as young people refused to go to Viet Nam in growing numbers. Many sought Canada as a refuge.

a case involving the laws of a single state.

imma say false because i dont know anything about this.