No one, including President Johnson, foresaw America’s first loss of a war, any more than the day’s tear gas victims pictured Selma as the last great thrust of a movement built on patriotic idealism. It was a turning point. The tide of confidence in equal citizenship had swelled over decades to confront segregation as well as the Nazis, and would roll forward still, but an opposing tide of resentment and disbelief rose to challenge the overall direction of American politics, contesting the language of freedom.

