As we gather with family and friends this week to mark the Fourth of July, let us keep in mind the defining value that sets this nation apart – the founding principle that stands as our greatest cause for pride and celebration: that every American deserves an equal opportunity to achieve a happy and fulfilling life. Equality of opportunity is the driving force behind the American Dream. Yet while this Dream was born on a July day in 1776, one of its greatest strides toward full realization came on a July day in 1964. The enactment of the Civil...