To evade going into an internment camp, Korematsu had facial surgery and claimed to be Mexican-American. He was later caught and convicted. He fought his conviction by saying the Relocation Orders were unconstitutional.
The U.S government was afraid of people of Japanese descent being spies or fighting for Japan. Because of this President Franklin D. Roosevelt put all of them in horrible places called internment camps. They were convicting Fred Korematsu for avoiding being put into a camp.
The Supreme Court decided it was constitutional to lock up people because of their heritage.
Changes in law
There were no changes in the law.
Changes in culture
It set the precedent that American citizens could be locked up even if they have committed no crimes.