The first 100 days of a new administration are the period of maximum political capital and minimum institutional resistance. What is done in them shapes what is possible for the next four years.
Why the 100 Days Matter
The first 100 days of a new administration — a benchmark traced to Franklin Roosevelt's first legislative burst in 1933 — matter not because legislative history is accurately measured in 100-day increments but because the political conditions that enable ambitious institutional change are at their peak in the immediate post-inaugural period. The new administration has its mandate at its freshest, its political opposition at its most disorganised, its own coalition at its most unified, and the public's attention at its most engaged. These conditions decay: the mandate ages, the opposition organises, the coalition fractures, and the public's attention moves on. The window for the changes that require maximum political capital is wider at the beginning than it will ever be again.
The strategic implication is the sequencing principle: the hardest, most politically expensive changes should be pursued first, when political capital is highest, and the easier changes should be saved for when the capital has diminished but the institutional momentum of early action can still be exploited. The administration that spends its first 100 days on symbolic actions and easy wins, preserving its political capital for the hard changes that are supposedly coming later, typically finds that the later moment arrives with less capital than the earlier moment would have provided.
The first 100 days are the window that institutional change needs and that institutional resistance is least equipped to exploit. The administration that understands this pursues its hardest priorities first. The administration that does not learns too late that the political capital it preserved for later was already spent by the time it tried to use it.
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