Why was the inauguration day changed to January 20?

The Constitution of the United States had established March 4 as Inauguration Day in order to allow enough time after Election Day for officials to gather election returns and for newly-elected candidates to travel to the capital. With modern advances in communication and transportation, the lengthy transition period proved unnecessary and legislators pressed for change. The date was moved to January 20 with the passage of the Twentieth Amendment in 1933.

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