1931 - March 3 – The Star-Spangled Banner is adopted as the United States National anthem.

ANTHEM BILL PASSED
WASHINGTON - March 3 - (AP) - The Senate today passed and sent to the House a bill to make "The Star Spangled Banner" the national anthem. The bill was approved without debate after Senator Tydings, Democrat, Maryland, had persuaded senators to withdraw objections which had previously prevented its passage.