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1,991 facts in History. Click any fact to see its full page.
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The Louisiana Purchase in 1803 doubled the size of the United States.
George Washington was the first President of the United States.
The Bill of Rights consists of the first ten amendments to the Constitution.
The U.S. Constitution was ratified in 1788.
The United States Declaration of Independence was adopted in 1776.
Project Blue Book officially ended in 1969.
The U.S. government established the Office of Strategic Services during World War II.
The FBI monitored communications under classified programs during the 20th century.
The CIA maintained classified files on covert activities during the Cold War.
Operation Ajax was publicly acknowledged decades after it occurred.
The CIA declassified documents regarding covert Cold War activities in the 1990s.
The U.S. government conducted Operation Crossroads nuclear tests after World War II.
The NSA was officially established in 1952.
Operation Gladio involved secret Cold War networks in Europe.
The CIA’s Phoenix Program operated during the Vietnam War.
The CIA funded cultural organizations during the Cold War as part of influence efforts.
Operation Ivy Bells involved Cold War submarine intelligence gathering.
The U.S. government conducted atmospheric nuclear tests before test bans were implemented.
The FBI's COINTELPRO targeted several activist groups in the 1960s and 1970s.
The CIA conducted covert operations in Southeast Asia during the Vietnam War.
The NSA developed tools for cryptographic analysis during World War II.
Operation Mongoose aimed to destabilize Cuba in the early 1960s.
The CIA supported anti-communist efforts in various countries during the Cold War.
The CIA’s Family Jewels documents detailed internal investigations of misconduct.
Operation Fast and Furious involved gun tracking efforts that became controversial.
The U.S. government ran Project Stargate to study alleged psychic phenomena.
The CIA declassified documents regarding Cold War covert operations decades later.
The CIA experimented with sensory deprivation techniques in the 1950s.
The FBI conducted surveillance of civil rights leaders during the 1960s.
The NSA’s Stellar Wind program monitored communications after 9/11.
Operation PBSUCCESS involved CIA actions in Guatemala in 1954.
The CIA's Operation Ajax helped orchestrate a coup in Iran in 1953.
The NSA’s ECHELON system monitored international communications during the Cold War.
The Church Committee investigated intelligence agency activities in the 1970s.
The CIA’s Project ARTICHOKE preceded MK-Ultra in studying interrogation methods.
Project SHAMROCK involved the collection of international telegrams.
The U.S. government conducted nuclear tests in Nevada during the mid-20th century.
Operation CHAOS gathered intelligence on domestic protest movements in the 1960s.
The NSA was revealed to have conducted mass surveillance programs in 2013 disclosures.
The CIA conducted Operation Mockingbird to influence media during the Cold War.
The Iran-Contra affair involved secret arms sales and funding operations in the 1980s.
Watergate involved a political break-in that led to the resignation of President Nixon.
The NSA's PRISM program collected digital communications under classified authority.
The Gulf of Tonkin incident was later shown to involve disputed reports of attacks.
Operation Northwoods was a proposed U.S. plan in the 1960s that was never carried out.
The Tuskegee Syphilis Study withheld treatment from participants for decades.
The Pentagon Papers revealed previously undisclosed details about U.S. involvement in Vietnam.
Operation Paperclip brought German scientists to the United States after World War II.
COINTELPRO was an FBI program aimed at monitoring and disrupting political organizations.
Project MK-Ultra was a CIA program that conducted experiments on mind control techniques.