"Our country has changed" and with those four words, Chief Justice John Roberts and the court's four other conservatives struck down a key part of the Voting Rights Act of 1965.
The law requires that nine states - mostly in the south and all with a history of discrimination at the polls get federal approval before changing their voting laws.
Today the court ruled that the formula used to determine which states are covered is outdated.
The Obama administration quickly expressed its disappointment with the ruling.
"I am deeply disappointed, deeply disappointed with the court's decision in this matter," U.S. Attorney General Eric Holder said. "This decision represents a serious setback for voting rights and has the potential to negatively affect millions of Americans across the country."
What does this ruling mean for the Civil Rights movement?
CNN Legal Analyst Jeffrey Toobin is OutFront.