Final Answer:
The landmark case resulting from FDR's 9066 executive order was the Korematsu v. United States case, in which the turnout was a controversial Supreme Court decision upholding the constitutionality of the forced relocation and internment of Japanese-Americans during World War II.
Step-by-step explanation:
The Korematsu v. United States case emerged as a significant legal battle following President Franklin D. Roosevelt's issuance of Executive Order 9066 during World War II. This order authorized the forced relocation and internment of Japanese-Americans on the West Coast, affecting more than 120,000 individuals, many of whom were American citizens. Fred Korematsu, an American of Japanese descent, challenged this order, leading to a Supreme Court decision in 1944.
The Supreme Court's decision, by a 6-3 majority, in Korematsu v. United States was highly controversial. The Court upheld the constitutionality of the internment, arguing that it was a military necessity to prevent espionage and sabotage. This decision has since been widely criticized for its failure to protect the civil rights of Japanese-Americans and has been considered one of the darker chapters in the history of American jurisprudence.
The aftermath of the Korematsu case underscores the impact of wartime policies on civil liberties and the challenges of balancing national security with individual rights. In later years, the case was revisited, and it was officially repudiated by the U.S. government, acknowledging the injustice done to those who were interned during that period.