"The Year of Birmingham," 1963, was a cataclysmic turning point in America's long civil rights struggle. That spring, child demonstrators faced down police dogs and fire hoses in huge nonviolent marches for desegregation. A few months later, Ku Klux Klansmen retaliated by bombing the Sixteenth Street Baptist Church and killing four young black girls. Diane McWhorter, journalist and daughter of …