[Answer] When did Father's Day become an official U.S. holiday?

Step 1 : Introduction to the question "When did Father's Day become an official U.S. holiday?"

...The nation's first celebration to honor the importance of fathers was in a West Virginia church in July, 1908. The intention was to memorialize 362 men lost in a mining explosion the previous December. This was a single event, however, that wasn't repeated the following year. Sonora Smart Dodd of Spokane, Washington, tried the following year to establish an official day to celebrate fathers. The idea spread slowly, but in 1972, Richard Nixon finally made Father's Day a federal holiday. Source: History.com

Step 2 : Answer to the question "When did Father's Day become an official U.S. holiday?"

1972:

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