First 100 days of the Obama presidency
The first 100 days of the Obama presidency began on January 20, 2009, the day Barack Obama was inaugurated as the 44th president of the United States. The first 100 days of a presidency took on symbolic significance during Franklin D. Roosevelt's first term in office, and the period is considered a benchmark to measure the early success of a president.
Source: Wikipedia — First 100 days of the Obama presidency (CC BY-SA 4.0)