President-elect Donald J. Trump claimed a powerful mandate for his legislative agenda, having swept key battleground states, but won the popular vote by only 1.5 percentage points.
In this competitive era of elections, landslide victories are rare, as the popular vote margin since 1988 has been within 10 percentage points, reflecting the country's stark political divide.
Political polarization has deepened, with both parties increasingly using data to target voters. This has contributed to the infrequency of presidential landslide elections.
Last year marked a notable shift, as Republicans won the popular vote for the first time since 2004, with a significant six-point swing towards the party.
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