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Oldest Human-Made Structures in the US That Date Back to 9000 B.C.

The way individuals view history is always changing due to discoveries. Historians often seem to unearth something new that throws off their theories just when they believe they have everything worked out. Consider the first known man-made buildings in the United States.

The earliest constructions were long believed to be from 3500 B.C., however more recent research from 2022 has revealed that several locations in the US are beyond 9000 BC old.

Continue reading below to find out more about these structures, including where they are.

Where Are the Oldest Human-Made Structures in the US?

The oldest buildings in the United States are probably located far from civilization, deep in the woods. But you would be entirely incorrect.

Nestled in the center of Baton Rouge, Louisiana, are the oldest buildings in the United States, dating back to 3500 B.C. More precisely, on the north side of the campus of Louisiana State University (LSU) are the two buildings that are currently regarded as the biggest man-made structures in the United States.

Which American structures are the oldest created by humans?

The two mounds on the north end of the campus are perhaps familiar to many who have visited LSU in the past. They stick out from the surrounding flat countryside and seem a little out of place. Mound A and Mound B are their names.

Even though the mounds may have just been dismissed by many as an odd campus decoration, much more intriguing activity is actually taking place.

It was humans who created these mounds. Scientists have long known that these mounds are ancient and man-made. But nobody ever anticipated how old they would be. After careful examination, researchers discovered that the oldest mound is more than 11,000 years old.

History of the Mounds

Although there is still much to learn about the mounds, experts are beginning to piece everything together. Mound B is estimated to have been in use for tens of thousands of years. Approximately 8,200 years ago, the mound was deserted.

It is known that at that time, the temperature dropped by roughly 35 degrees Fahrenheit and remained that way for almost 160 years, even if experts are still unsure of why. People had either get used to the cold or leave the area. Here, it appears that the individuals made the decision to leave.

Then people returned 7,500 years ago. The construction of a second mound was among their initial assignments. Mound A is about thirty feet distant.

While investigating the mound, experts found another intriguing aspect of it. Both pointed in the direction of Arcturus, a red star. The mounds line in the same direction as the star did when it rose in the sky at that particular point in time throughout history.

The Purpose of the Mounds

Scientists researching the mounds found layers of clay, ash, vegetation, and broken bones at the center of each one.

The burning of reed and cane is supposed to have indicated the mounds’ ceremonial or religious purpose.Since they burn too hotly, canes and reeds are not frequently used in cooking.

The Discovery of Watson Brake

Since the mounds have existed since before European settlers even set foot in North America, and maybe even before Europe itself, it is impossible to date their discovery. The oldest man-made buildings in North America were discovered at Watson Brake, Louisiana, on September 19, 1997. Their estimated age was 5,400 years. As a result, they were two millennia older than nearby mounds.

From Louisiana to Florida, there are mounds in the area. This 5,400-year-old finding alone was sufficient to radically alter the course of North American history. The discovery of ones that date back more than 11,000 years has further changed the historical narrative of North America.

Not every mound has a structure that is as old as 9000 B.C. On the campus of LSU, even the two mounds next to one another share the same date. Mound B, the southernmost mound, is older than Mound A, the other mound.

Mound A is barely 7,500 years old, whilst Mound B dates to 11,000 years ago. Even though the two hills are somewhat different in age, they are both very old. Both are actually older than the Egyptian pyramids. Only 4,700 years ago was the oldest pyramid, known as the Pyramid of Djoser, built.