Following a string of high-profile police shootings of Black men 10 years ago, San Francisco 49ers quarterback Colin Kaepernick began protesting such incidents by sitting during the national anthem at preseason games. What began as a quiet action turned into a fevered national debate about freedom of expression, patriotism, and so much more. In Kaepernick’s new memoir, The Perilous Fight, the quarterback explains that his action was spontaneous. He wasn’t even in uniform on August 13, 2016, the first time he sat during the anthem. Kaepernick writes. “I didn’t want to stand up while that song was playing. Rosa Parks had refused to give up her seat on the bus to a white person in 1955. Muhammad Ali wouldn’t step forward when his name was called by the draft board for the Vietnam War in Louisville in 1967. Tommie Smith and John Carlos raised black-gloved fists in the air during the playing of the anthem at the 1968 Olympics. They didn’t like what they saw, the way this nation touted its...