Francis Scott Key, a lawyer from Maryland, wrote “The Star-Spangled Banner” after witnessing the British attack on Fort McHenry in Baltimore during the War of 1812. The song, originally a poem, officially became the national anthem in 1931.
But it’s been performed at sporting events since the mid-1800s. The practice became more widespread in the period of intense patriotism that swept the nation during World War II (1939-1945). Today, all four major sports leagues—baseball, football, basketball, and hockey—ask fans and players to stand and remove their hats during the anthem.
That link between patriotism and sports is one reason Americans feel so strongly about the anthem at games—and why the protests have caused such controversy.
According to a recent Washington Post-Kaiser Family Foundation poll, 53 percent of Americans think it’s “never appropriate” to kneel during the anthem, compared with 42 percent who say it’s sometimes appropriate.