First hundred days
Encyclopedia
The first hundred days is a sample of the first 100 days of a first term presidency of a president of the United States
President of the United States
The President of the United States of America is the head of state and head of government of the United States. The president leads the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces....

. It is used to measure the successes and accomplishments of a president during the time that their power and influence is at its greatest.
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