It depends on the country but I guess that u are talking about United States constitution so:
C. The senate
He purchased Alaska from Russia in 1867. He defied Congress Tenure of Office act on grounds that it was unconstitutional (which He was impeached for, but the Supreme Court agreed with Johnson's reasoning) He was accommodating to the Southern states, and advocated less harsh treatment of the defeated rebels than other politicians of the time (which quickened the healing process from the Civil War) He served in the Senate after his Presidential term expired, showing further willingness to work for the public good despite his impeachment embarrassment. He protected the rights of the Executive branch against Congress' attempt to diminish it's powers.
Important reasons for studying history are recognizing patterns, connecting the past to the present and revealing past contributions of civilizations.
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The 1877 Commitment promoted political action that was not concerned with the slave situation, but with party disputes between Democrats and Republicans. The action of withdrawing federal troops from the south was not intended to provide a relief of tension in the relationship between slaves and their self-proclaimed owners, but rather aimed at securing the political hegemony of the Republicans, leaving the slaves at bay.
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It depends on which war you're referring to. I feel that the answer you're looking for is the radio, though.