First regular US TV programming

According to Official Guinness Records,

Franklin D Roosevelt (USA) opens the 1939 New York’s World Fair (30 April), relayed to the nation via a high-definition telecast.

For a complete list of 1939 records, please visit 1939 Guinness Records in United States.

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Other United States records that might interest you:

• Longest career as a catwalk model
• Most wins consecutively of an Oscar award for best actor
• Most successful golf Ryder Cup captain
• Most bioluminescent insect
• Smallest centipede