Students of color and those who are immigrants or LGBT face unprecedented levels of bullying and hate speech that pose significant obstacles to their readiness to learn. Such marginalized students can't help but be affected by rising tides of White Nationalism, Islamaphobia, anti Semitism, and similar expressions of intolerance. This book frames our current, post-election predicament in the greater context of historical change. Cultural Proficiency can help cut through the rancor and noise, become a rallying cry for action and, ultimately, provide school leaders with essential vocabulary and tools for acting on the promise of public schooling.