An official website of the United States government                

----

end of header

# History

###### You are here: Census.gov ›  History ›  Home Page Archive › 2020 › July  2020

Skip top of page navigation

                - History Main
                - Agency History                    - Director Biographies
                  - Census Facilities
                  - Suitland, MD
                  - Notable Alumni
                - Innovations                    - Data Collection
                  - Technology
                - Programs                    - Agriculture
                  - Demographic
                  - Housing
                  - Economic
                  - Geography
                  - Governments
                - Through the Decades                    - Fast Facts
                  - Overview
                  - Index of Questions
                  - Questionnaires
                  - Census Instructions
                - Genealogy                    - Decennial Census Records
                  - Other Resources
                - Reference                    - Data@Museums
                  - Artifacts
                  - Lesson Plans
                  - Legislation
                  - Maps
                  - Oral Histories
                  - Privacy & Confidentiality
                  - Apportionment
                  - Publications 
                - Home Page Archive                    - 2024
                  - 2023
                  - 2022
                  - 2021
                  - 2020
                  - 2019
                  - 2018
                  - 2017
                  - 2016
                  - 2015
                  - 2014 
                - FAQs                    - Genealogy
                  - Agency History
                  - Demographic
                  - Economic
                  - Governments
                  - Agriculture
                  - Geography
                  - Innovations
                  - Miscellaneous

### 2020

### Also in this Section:

                          - January 2020
                          - February 2020
                          - March 2020
                          - April 2020
                          - May 2020
                          - June 2020
                          - July 2020
                          - August 2020
                          - September 2020
                          - October 2020
                          - November 2020
                          - December 2020

## July 2020

----

### Visit *https://www.census.gov/history* every month for the latest Census History Home Page!

----

### U.S. Census Bureau History: The Manhattan Project

             On December 28, 1942, President Franklin D. Roosevelt authorized the "Manhattan Project"with the goal of weaponizing nuclear energy.  Under the direction of nuclear physicistJ. Robert Oppenheimer and Lieutenant General Leslie R. Groves, thousands of peopleworked under strict secrecy at sites throughout the United States.On July 16, 1945, years of research and design culminated in the detonation of theworlds first atomic bomb northwest of Alamogordo, NM.  Two months later, Grovesand Oppenheimer returned to the site (above) for photographs.Photo courtesy of the Library of Congress.

On July 16, 1945, scientists led by civilian physicist J. Robert Oppenheimer and Lieutenant General Leslie R. Groves successfully tested a weaponized release of atomic energy in the New Mexican desert.  The blast—known as the "Trinity Test"—was the culmination of years of research conducted at sites throughout the United States as part of the Manhattan Project.  The test produced a 22 kiloton blast and changed the course of World War II and the future of international relations.

Atomic research was underway at a number of universities in the United States in the late 1930s, including studies led by Ernest Lawrence at the University of California at Berkeley's Radiation Laboratory.  Enrico Fermi and Leo Szilard also led studies at Columbia University and later the University of Chicago.  Encouraged by these teams' research, President Franklin D. Roosevelt approved establishment of the Manhattan Engineer District—"The Manhattan Project"—on August 13, 1942, naming Lieutenant General Leslie R. Groves to oversee research into weaponizing atomic energy.

In October 1942, Groves selected University of California at Berkeley physicist J. Robert Oppenheimer to lead weapons research, and Oppenheimer chose a site near Los Alamos, NM, to conduct his work.  On December 2, 1942, Enrico Fermi's University of Chicago team successfully initiated the world's first, self-sustaining chain reaction.  Encouraged by this major development in atomic research, President Franklin D. Roosevelt approved funding for The Manhattan Project's research

Groves and Oppenheimer quickly began moving staff to sites throughout the United States including the primary research facility at Los Alamos, NM, and uranium processing installations in Benton County, WA; and Oak Ridge, TN, along with numerous smaller supporting facilities like those in Ames, IA; Morgantown, WV; and Sylacauga, AL.  By early 1944, the scientists had successfully developed the infrastructure necessary to sustain the nation's atomic weapons program and produced designs for uranium- and plutonium-fueled bombs by mid-1945.

On July 13, 1945, the Manhattan Project scientists began assembling the plutonium bomb—nicknamed "The Gadget"—in a remote area of New Mexico's Socorro County, chosen as the site for the "Trinity Test."  Upon completion, it was hoisted to the top of a 100-foot steel tower and armed late in the evening of July 15.  As American B-29s circled overhead and scientists and military personnel observed from the ground, the device exploded at 5:29 a.m., releasing energy equivalent to 22 kilotons of TNT.  The heat from the blast melted the nearby sand into glass and according to an eyewitness account, "the whole country was lighted by a searing light with the intensity many times that of the midday sun."  A mushroom cloud of radioactive smoke and debris rose more than 7 miles into the atmosphere and people reported feeling and hearing the blast more than 100 miles away.  Years later, Oppenheimer recalled that a line from the Hindu scripture /www.osti.gov/opennet/manhattan-project-history/Events/1945/trinity.htm">*Bhagavad Gita* came to mind upon witnessing the atomic blast: "Now I am become Death, the destroyer of worlds."

President Harry S. Truman authorized use of the untested uranium bomb ("Little Boy") and plutonium bomb ("Fat Man") on Japan in late July 1945.  On July 25, Acting Army Chief of Staff Thomas Handy ordered Commanding General Carl Spaatz of the Army Air Force's 509th Composite Group to target the Japanese cities of Hiroshima, Kokura, Niigata, and Nagasaki, Japan with atomic weapons.  On August 6, 1945, a B-29 bomber named *Enola Gay* left its base on the Pacific island of Tinian (Commonwealth of Northern Mariana Islands) for Hiroshima, Japan, carrying the 9,700 pound "Little Boy" uranium bomb.  The bomb detonated 1,900 feet above the city at 8:15 a.m. local time.  On August 9, the plutonium bomb "Fat Man" carried by a B-29 named *Bock's Car* exploded above Nagasaki, Japan.  Japan offered to surrender to the Allies the next day, and General Douglas MacArthur formally accepted Japan's unconditional surrender aboard the *USS Missouri* on /www.archives.gov/exhibits/featured-documents/japanese-surrender-document">September 2, 1945.

You can learn more about the Manhattan Project and Trinity Test using census data and records.  For example:
                        - Research to weaponize atomic energy as part of the Manhattan Project took place throughout the United States and populations near these atomic research and development installations grew as the United States added to its nuclear arsenal during the  Cold War .  For example, between the 1940s and 1960, Oak Ridge, TN, (home to the  Oak Ridge National Laboratory ) grew from a few thousand residents to  27,169 .  Similarly, the population of Los Alamos, NM, (site of the  Los Alamos National Laboratory ) grew from a few homesteads prior to World War II to  11,310  in 1970.  The growing demand for nuclear fuel from the Hanford Nuclear Reservation led the population of Benton County, WA, to grow from  12,053  in 1940 to  51,370  in 1950.  In 2010, the population of Oak Ridge, TN, was  29,330 .  The population of Los Alamos, NM, was  12,019 ; and although the Hanford Nuclear Reservation is no longer active,  175,177  still called Benton County, WA, home.
                        - In August 1939—3 years before President  Franklin D. Roosevelt  authorized the Manhattan Project— Leo Szilard ,  Edward Teller ,  Albert Einstein , and other prominent physicists sent the president a  letter  warning him of Nazi Germany's atomic research and urged the president to fund an American research program.  Roosevelt authorized the creation of the  Advisory Committee on Uranium , which funded the purchase of uranium and graphite for experimentation in late 1939. On December 2, 1942, a team of scientists led by  Enrico Fermi  succeeded in producing the first controlled, self-sustaining  nuclear chain reaction    in a reactor at the University of Chicago.  Later that same month, Roosevelt authorized the Manhattan Project with the goal of weaponizing atomic energy.
                        - In the decades since scientists weaponized atomic energy, the power unleashed by splitting atoms has found a more peaceful application through the generation of electricity.  President  Dwight D. Eisenhower  commissioned the nation's first commercial nuclear power plant—the  Shippingport Atomic Power Station —in Shippingport,  Beaver County, PA , on May 26, 1958.  By 2017, the U.S. Census Bureau's County Business Patterns Survey reported there were  178 nuclear electric power generation establishments (NAICS 22113)  in the United States employing nearly  48,000  people.  North and South Carolina led the nation for the number of nuclear power generating establishments with   32  and  25 establishments , respectively.
                        - Thirteen years after the Manhattan Project's July 1945 Trinity Test, the world's first nuclear-powered submarine—the  USS Nautilus  (SSN-571)—completed the first-ever submerged transit of the geographic North Pole on  August 3, 1958 .  Learn more about the  USS Nautilus  and other historic submarines at our  History Web page commemorating the 60th anniversary of *Nautilus'* polar journey .
                        - The United States was the only nation possessing atomic weapons until the Soviet Union successfully detonated a 22-kiloton bomb in Kazakhstan on  August 29, 1949 .  Top secret documents provided by American citizens  Julius  and  Ethel Rosenberg  were key to the Soviet's nuclear weapons program.  According to Soviet leader Nikita Khrushchev, the Rosenbergs "provided very significant help in accelerating the production of our atomic bomb."  The couple was convicted of espionage on  March 29, 1951 , and executed at the Sing Sing Correctional Facility in  Ossining, NY , on  June 19, 1953 .  Over the next 60 years,  nuclear weapons proliferated  as Great Britain, France, China, India, Pakistan, and North Korea tested their own atomic weapons.  The heavy metal uranium was key to the development of the United States' first atomic weapon.  When an uranium atom splits, it releases heat.  A fission chain reaction is achieved when splitting atoms cause other atoms to split. Multiplied millions of times, the reaction releases an enormous amount of heat from a small amount of uranium.  Today the highest concentrations of Uranium are found in the western and southwestern United States.  The 2017 Economic Census reported that 18 establishments were involved in the mining of uranium, radium, and vanadium ore (NAICS 212291) in the United States employing 475 employees.According to the U.S. Department of Labor, there were 
16,730
 physicists employed in the United States earning a mean annual wage of 
$123,080
 in May 2019.  California (
1,950
), Maryland (
1,880
) and New Mexico (
1,740
) led the nation for the number of physicists employed.  Many of these physicists are federal employees.  They work at agencies including the National Aeronautic and Space Administration which employs 
astrophysicists
; the 
U.S. Nuclear Regulatory Commission
 which employs nuclear physicists to regulate the civilian use of nuclear power and materials; and the U.S. Department of Energy which employs and awards grants to physicists to perform research at facilities, including 
Oak Ridge National Laboratory
 in 
Oak Ridge, TN
; 
Argonne National Laboratory
 in 
Lemont, IL
; 
Lawrence Livermore National Laboratory
 in 
Livermore, CA
; 
Los Alamos National Laboratory
 in 
Los Alamos, NM
; and 
Sandia National Laboratories
 in 
Albuquerque, NM
, and 
Livermore, CA
.
     
After years of research, the Manhattan Project successfully detonated the world's first nuclear device at 5:29 a.m., on July 16, 1945.  Conducted 75 miles northwestof Alamogordo, NM, the Trinity Test released between 18 and 22 kilotons of explosive energy proving that atomic energy could be weaponized.The U.S. Army erected a monument at the detonation site in 1965.  On December 21, 1965, The U.S. National Parks Service declared the Trinity Test Site and morethan 50,000 acres surrounding the site—now part of the White Sands Missile Range—a National Historic Landmark district.  On October 15, 1966, it was listedon the National Register of Historic Places.Image courtesy of the National Parks Service.Atomic Occupations
In 2017, the American Community Survey estimated that the United States was home to 5,930 nuclear engineers and 3,361 nuclear technicians.In addition to academic pursuits, many of these professionals work at nuclear electric power generation facilities (NAICS 221113); pharmaceutical manufacturers  specializing in radiology and nuclear medicine (NAICS 325412); and naval ship building and repairing (NAICS 336611).
View larger imageEinstein
Physicist Albert Einstein (shown above participating in the 1950 Census) and his wife immigrated to the United States in 1933 and settled in Princeton, NJ.  He became a permanent resident while working at the Institute for Advanced Study  in 1935, and an American citizen in 1940.Despite being one of the world's premier physicists, Einstein's pacifism and socialist beliefs led President Franklin D. Roosevelt's administration to prohibit Einstein from participating in the Manhattan Project.  Instead, Einstein lent his expertise to the U.S. Navy by evaluating weapons systems and raising money for the war effort.Use census data and records to learn more about Einstein and his research at our March 2019 Web page commemorating the physicist's 140th birthday.
View larger imageThis Month in Census HistoryPrior to 1902, the U.S. Census Bureau was a temporary agency opened to conduct the census and closed when staff completed publishing data each decade.On March 6, 1902, Congress enacted legislation creating the permanent Census Bureau.  The agency officially opened its doors as part of the Department of the Interior on July 1, 1902.The Census Bureau moved to the newly created Department of Commerce and Labor in 1903, and remained within the Department of Commerce following the creation of separate Departments of Commerce and Labor in 1913.Today, the Census Bureau is headquartered in Suitland, MD.  It remains part of the Department of Commerce under the leadership of Secretary Wilbur L. Ross, Jr. and agency director Dr. Steve Dillingham.**Visit *https://www.census.gov/history* every month for the latest Census History Home Page!**~~~~[an error occurred while processing this directive]  This symbol  indicates a link to a non-government web site.  Our linking to these sites does not constitute an endorsement of any products, services or the information found on them. Once you link to another site you are subject to the policies of the new site.CONNECT WITH US**********- Information Quality
- Data Linkage Infrastructure
- Data Protection and Privacy Policy
- Accessibility
- FOIA
- Inspector General
- No FEAR Act
- U.S. Department of Commerce
- USA.gov

Measuring America's People, Places, and Economy
✕Is this page helpful?YesNo✕NO THANKS255 characters maximum255 characters maximum reached✕Thank you for your feedback.Comments or suggestions?   Source: U.S. Census Bureau | Census History Staff |  Last Revised: December 14, 2023