Who was the first US President resigned from office?

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Who was the first US President resigned from office?

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Fred Fiedler was the first researcher who implemented the contingency approach.

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But he was the first who ever did so by choice, principle.( 2.00 分 )

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nd authority．In the Far East in ancient times,the umbrella was allowed to be used only by royalty or by those in high office.In Europe,the Greeks were the first to use the umbrella as a sunshade．And the umbrella was in common use in ancient Greece．But it is believed that the first persons in Europe to use the umbrella as protection against the rain were the ancient Romans.During the Middle Ages,the use of the umbrella practically disappeared．Then it appeared again in Italy in the late sixteenth

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nd authority．In the Far East in ancient times,the umbrella was allowed to be used only by royalty or by those in high office.In Europe,the Greeks were the first to use the umbrella as a sunshade．And the umbrella was in common use in ancient Greece．But it is believed that the first persons in Europe to use the umbrella as protection against the rain were the ancient Romans.During the Middle Ages,the use of the umbrella practically disappeared．Then it appeared again in Italy in the late sixteenth

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