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The Mound Builders were groups of Native American cultures—most notably the Adena, Hopewell, and Mississippian societies—who constructed vast numbers of earthen mounds across the Midwest and Southeastern United States from about 3500 BCE until the 1500s CE. These impressive earthworks functioned as burial grounds, ceremonial centers, and foundations for important structures, reflecting sophisticated planning, social organization, and engineering skill.

Major Mound-Building Cultures

Adena Culture (1000 BCE – 1 CE):
Centered mainly in the Ohio Valley, the Adena people are recognized for some of the earliest conical burial mounds and circular ceremonial earthworks often referred to as “sacred circles.”

Hopewell Culture (200 BCE – 500 CE):
Building upon earlier traditions, the Hopewell created expansive geometric earthworks and effigy mounds shaped like animals. A well-known example is Serpent Mound in Ohio, believed to have ceremonial and astronomical significance.

Mississippian Culture (800 CE – 1600 CE):
The Mississippians developed large urban centers featuring massive, flat-topped platform mounds used for temples, elite residences, and public ceremonies. The largest site, Cahokia Mounds in present-day Illinois, stands as one of the most significant pre-Columbian cities north of Mexico and is now recognized as a UNESCO World Heritage Site.

Purpose and Importance

The mounds served multiple roles. Many were burial sites for important community members, while others elevated temples or leaders’ homes above surrounding settlements. Construction required transporting enormous amounts of soil—often millions of cubic feet—by hand, typically using woven baskets. These sites stretched from the Great Lakes region to the Gulf of Mexico, with especially dense concentrations along the Ohio and Mississippi River valleys.

Historical Misunderstandings

When European settlers first encountered these monumental earthworks, many doubted that Native American societies could have built them. This disbelief led to myths about a mysterious, vanished “race” of mound builders. However, systematic studies in the 19th century, including research conducted by the Smithsonian Institution, demonstrated conclusively that the mounds were constructed by the ancestors of contemporary Native American tribes. Today, these earthworks are recognized as powerful evidence of the rich cultural and technological achievements of Indigenous peoples in North America.

Many Americans are shocked to learn that their country is home to an ancient pyramid that stands as tall as 100 feet. Mysteriously, the fascinating history of Cahokia and its Monks Mound pyramid aren’t covered in most schools. Be that as it may, Cahokia was the largest pre-Colombian urban settlement north of the Rio Grande. And at its peak, it even had a bigger population than London at the time.

Cahokia started developing in the 10th century, and it became the most important settlement to the Mississippian culture from around the year 1050. Over the course of a couple centuries, Cahokia’s population would grow to as large as 40,000 people. And throughout their city, which took up an area of around 6 square miles (16 km2), the Cahokians built hundreds of mounds.

While the Cahokians left behind no written records, we know that the city was a thriving center of trade. It’s located just outside of modern-day St. Louis, while various materials found at the site come from as far as the Gulf Coast and the Great Lakes.

But for some reason, by around the year 1400, the city was mysteriously abandoned. There’s still a lot we don’t know about the ancient metropolis, but the city’s layout reveals a highly advanced knowledge of astronomy and geometry.

Today, despite its relative obscurity, getting to the Cahokia mounds is surprisingly easy. The site is a relatively short drive from St. Louis, while a tour around the mounds shouldn’t take more than half a day.

Who Were the Mississippians?

This mountain in Washington State has an eerie resemblance to the ancient pyramids of Egypt.

Tumtum Mountain is a small volcanic cone located in northern Clark County, Washington, at the edge of a flat region known as Chelatchie Prairie. Its remarkably symmetrical, cone-like shape makes it stand out from the surrounding landscape. The mountain rises to an elevation of 2,004 feet (611 meters), towering approximately 1,400 feet (430 meters above the prairie floor).

Formed by lava flows during the Pleistocene epoch, Tumtum Mountain is part of the Cascade Volcanic Arc. At an estimated age of about 70,000 years, it holds the distinction of being the youngest volcano in Washington’s Cascade Mountains and the westernmost in the range.

Operation Paperclip was a secret United States intelligence program in which more than 1,600 German scientists, engineers, and technicians were taken from former Nazi Germany to the US for government employment after the end of World War II in Europe, between 1945 and 1959; several were confirmed to be former members of the Nazi Party, including the SS or the SA.

The effort began in earnest in 1945, as the Allies advanced into Germany and discovered a wealth of scientific talent and advanced research that had contributed to Germany's wartime technological advancements. The US Joint Chiefs of Staff officially established Operation Overcast (operations "Overcast" and "Paperclip" were related, and the terms are often used interchangeably) on July 20, 1945, with the dual aims of leveraging German expertise for the ongoing war effort against Japan and to bolster US postwar military research. The operation, conducted by the Joint Intelligence Objectives Agency (JIOA), was largely actioned by special agents of the US Army's Counterintelligence Corps (CIC). Many selected scientists were involved in the Nazi rocket program, aviation, or chemical/biological warfare. The Soviet Union in the following year conducted a similar program, called Operation Osoaviakhim, that emphasized many of the same fields of research.

The operation, characterized by the recruitment of German specialists and their families, relocated more than 1600 experts to the US. It has been valued at US$10 billion in patents and industrial processes. Recruits included such notable figures as Wernher von Braun, a leading rocket-technology scientist. Those recruited were instrumental in the development of the US space program and military technology during the Cold War. Despite its contributions to American scientific advances, Operation Paperclip has been controversial because of the Nazi affiliations of many recruits, and the ethics of assimilating individuals associated with war crimes into American society.

The operation was not solely focused on rocketry; efforts were directed toward synthetic fuels, medicine, and other fields of research. Notable advances in aeronautics fostered rocket and space-flight technologies pivotal in the Space Race. The operation played a crucial role in the establishment of NASA and the success of the Apollo missions to the Moon.

Operation Paperclip was part of a broader strategy by the US to harness German scientific talent in the face of emerging Cold War tensions, and ensuring this expertise did not fall into the hands of the Soviet Union or other nations. The operation's legacy has remained controversial in subsequent decades. 

Background and Operation Overcast

The term "Overcast" was the name first given by the German scientists' family members for the housing camp where they were held in Bavaria. In late summer 1945, the JCS established the JIOA, a subcommittee of the Joint Intelligence Community, to directly oversee Operation Overcast and later Operation Paperclip. The JIOA representatives included the army's director of intelligence, the chief of naval intelligence, the assistant chief of Air Staff-2 (air force intelligence), and a representative from the State Department.

 In November 1945, Operation Overcast was renamed Operation Paperclip by Ordnance Corps officers, who would attach a paperclip to the folders of those rocket experts whom they wished to employ in the United States.

The project was not initially targeted against the Soviet Union; rather the concern was that German scientists might emigrate and continue their research in countries that remained neutral during the war.[6] Much US effort was focused on Saxony and Thuringia, which on July 1, 1945, became part of the Soviet occupation zone. Many German research facilities and personnel had been evacuated to these states before the end of the war, particularly from the Berlin area. The USSR then relocated more than 2,200 German specialists and their families—more than 6,000 people—with Operation Osoaviakhim during one night on October 22, 1946.

In a secret directive circulated on September 3, 1946, President Truman officially approved Operation Paperclip and expanded it to include 1,000 German scientists under "temporary, limited military custody". News media revealed the program as early as December 1946.

On April 26, 1946, the Joint Chiefs of Staff issued directive JCS 1067/14 to General Eisenhower instructing that he "preserve from destruction and take under your control records, plans, books, documents, papers, files and scientific, industrial and other information and data belonging to ... German organizations engaged in military research"; : 185  and that, excepting war-criminals, German scientists be detained for intelligence purposes as required.