
On December 7, 1941, the Imperial Japanese Navy’s raid on Pearl Harbor stunned Americans who had long thought their neighboring oceans would shield them from foreign military assault. Though ties with Japan had broken in recent months due to the empire’s takeover of French Indochina and America’s halting of oil shipments in protest, few if any had predicted such ruin. Even fewer expected it on a day often used for rest and churchgoing, let alone weeks before Christmas. “December 7, 1941,” President Franklin Delano Roosevelt told a joint session of Congress the next day, “a date which will live in infamy.” The president asked the House and Senate to authorize war on Japan. Near-unanimous approval came minutes later.
Some newspaper writers and political figures urged the public not to respond with racism or xenophobia, particularly against the roughly 285,000 people of Japanese ancestry who lived in either Hawaii or the continental US. The Alien Enemies Act of 1798, which only two presidents before Roosevelt had invoked, allowed him to subject any foreign national to arrest whenever a “predatory incursion” is “perpetrated, attempted, or threatened.” In the case of Presidential Proclamation 2525, issued hours after the Pearl Harbor attack, the “alien enemies” were Japanese-born American non-citizens, or Issei.
The US Navy ordered Issei-owned fishing boats back onto land. Issei-owned bank accounts were frozen. The US Department of Justice ordered all Japanese-born people to surrender their firearms, knives, shortwave radios, and cameras. In Hawaii and on the West Coast, where most Japanese Americans lived, agents with the Federal Bureau of Investigation began rounding up Issei men who seemed to maintain the strongest ties to Japanese culture. Unlike German and Italian citizens in America, Japanese citizens caught in the Alien Enemies Act could not legally naturalize as US citizens at the time. due to the Supreme Court’s 1922 ruling in Ozawa v. United States and the Immigration Act of 1924. It was not until the passage of the McCarran-Walter Act of 1952 that the Issei were allowed to naturalize.
Jim Morita oral history interview, July 17, 2023, courtesy of Manzanar National Historic Site
In 1940, Japanese Americans comprised only 2 percent of California’s population and less than one one-thousandth of the continental US population—but suspicions of mass takeovers festered all the same. “I am for the immediate removal of every Japanese on the West Coast to a point deep in the interior,” Hearst Newspapers columnist Henry McLemore wrote in January 1942. “Herd ’em up, pack ’em off. … Let ’em be pinched, hurt, hungry, and dead up against it.”
The president’s proclamation on January 14, 1942, required noncitizens from Italy, Germany, and Japan to register with the US Department of Justice, but a growing crowd wanted the White House to go further — especially on Japanese matters. Los Angeles-based Congressman Leland Ford sent identical letters to Secretary of War Henry Stimson and Attorney General Francis Biddle, demanding that “all Japanese, whether citizens or not, be placed in inland concentration camps. … [I]f an American-born Japanese, who is a citizen, is really patriotic and wishes to make his contribution to the safety and welfare of this country, right here is the opportunity to do so.”
- Read more: “From Infamy to Incarceration,” by Harrison Golden
On February 19, 1942, Roosevelt signed Executive Order 9066. The order authorized the Department of War “to prescribe military areas … from which any or all persons may be excluded.” Japanese Americans were not mentioned in the order. Nor were any specific races, ethnicities, or nationalities. No person of Japanese ancestry in the US had been — or would be — charged, tried, or convicted of crimes against America. Yet there was no doubt: The order targeted them.
Less than a week later, the US Navy ordered about 500 Japanese American families on California’s Terminal Island to leave within 48 hours. A proclamation issued on March 2 split California, Oregon, Washington, and Arizona into two military areas. An executive order signed on March 18 created the War Relocation Authority (WRA), a civilian agency tasked with relocating Issei, Nisei (U.S.-born citizens of Japanese descent), and their families to places inland. On March 29 the military stopped allowing “voluntary” relocation. A curfew took effect for all enemy aliens and “persons of Japanese ancestry” who still lived within the military areas: 8 PM to 6 AM, with no movement allowed anytime “more than five miles from their place of residence.”
The last day of March brought an even more sweeping move. Notices of exclusion orders began covering store windows, poles, fences, and bulletin boards all along the West Coast, with this heading: “INSTRUCTIONS TO ALL PERSONS OF JAPANESE ANCESTRY.” From the moment these were posted, heads of households had to register with local military offices. Families often had less than a week to surrender at a designated place.
(National Archives and Records Administration)
Without trial or proof of guilt, most were stuffed inside buses and trains, often with window shades down. Only when they neared their destination did the wheels slow and shades go up. From behind the window glass, they saw barbed wire, searchlights, watchtowers, and soldiers with machine guns. They arrived at what the government called an “assembly center,” a harmless-sounding term for yet another cramped space. Most of the 15 or so military-run assembly centers stood on converted fairgrounds or racetracks.
The assembly centers stayed filled for months, until the WRA finished building what it generously called “relocation centers.” These camps were more isolated and permanent, with 10 in all:
- Amache: Granada, Colorado
- Gila River: Rivers, Arizona
- Heart Mountain: Cody, Wyoming
- Jerome: Denson, Arkansas
- Manzanar: Manzanar, California
- Minidoka: Hunt, Idaho
- Poston: Parker, Arizona
- Rohwer: McGehee, Arkansas
- Topaz: Delta, Utah
- Tule Lake: Newell, California
By the time the US government had hauled 120,000 Japanese Americans into the new camps, it was late October. The Battle of Midway, which eliminated any chance Japan had of invading the West Coast, had been over since the first week of June. “If military necessity was the only reason for evacuation, it could have stopped right there,” a writer said long after the war. “But sometimes people and governments continue mistakes rather than admit them.”
Incoming incarcerees stand in line at a registration table at the Manzanar incarceration camp. (Courtesy of County of Inyo, Eastern California Museum)




