Why Are U.S. Mailboxes Blue?

U.S. mailboxes have been many different colors, but blue was adopted surprisingly recently. Here's the story behind the shade ...
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USPS New Year’s Day schedule: Blue collection boxes, Priority Mail Express – what’s open, what’s closed on 1 January

The United States Postal Service (USPS) will shut down operations across all its post offices on Thursday, 1 January, as the world welcomes the new year, as per its official holiday schedule. 1 ...