Executive Order 9066’s official purpose was to authorize the U.S. military to create “military areas” and exclude any people from them in the name of preventing espionage and sabotage during World War II. In practice, it became the legal basis for the mass removal and incarceration of about 120,000 people of Japanese ancestry—most of them American citizens—from the West Coast into incarceration camps. Though written in neutral language that did not name any specific group, it was overwhelmingly used against Japanese Americans, reflecting wartime hysteria and racism more than proven security threats.

Core purpose in 1942

  • The order empowered the secretary of war and military commanders to designate military areas and exclude “any or all persons” from them to protect national defense facilities from espionage and sabotage.
  • It framed mass exclusion as a wartime necessity after the attack on Pearl Harbor, presenting removal as a security measure rather than as punishment of a specific ethnic group.

What it actually did

  • The order was applied to virtually all Japanese Americans on the West Coast, forcing them to leave their homes, businesses, and communities and move to government-run camps further inland.
  • It enabled curfews, “exclusion orders,” and the creation of “relocation centers” (now widely recognized as incarceration or concentration camps) where families lived behind barbed wire under armed guard.

Stated motives vs. real drivers

  • Officially, the order cited the “successful prosecution of the war” and the need for “every possible protection against espionage and sabotage.”
  • Historians emphasize that racial prejudice, economic envy, and political pressure—combined with wartime panic and very thin evidence of actual disloyalty—were major forces behind its creation and use.

Impact and later judgment

  • Executive Order 9066 led to one of the largest mass removals in U.S. history, devastating Japanese American communities socially, psychologically, and financially.
  • Decades later, the U.S. government formally acknowledged that the policy was unjustified and motivated by “race prejudice, war hysteria, and a failure of political leadership,” and offered a national apology and limited reparations to survivors.

Why it matters today

  • The order is now studied as a cautionary example of how civil liberties can be suspended when fear overrides constitutional protections.
  • Modern debates about national security, immigration, and surveillance often invoke Executive Order 9066 as a warning about targeting entire communities as “threats” based on ancestry or appearance rather than individual conduct.

TL;DR: The purpose of Executive Order 9066 was to give the military broad power to exclude people from designated areas in the name of wartime security, but in reality it functioned as the legal tool that enabled the mass incarceration of Japanese Americans on the West Coast—a policy later condemned as a grave violation of civil rights.

Information gathered from public forums or data available on the internet and portrayed here.