• In the Ohio River Valley, large mounds and earthen walls that reach more than 3 meters (12 feet) high are remnants of a people who resided in the region from 200 BCE to 500 CE. Perhaps more impressive than the mounds and earthworks of the Hopewell tradition—a culture that included various Native American tribes—are a collection of artifacts suggesting they had regular contact with cultures thousands of kilometers away.

    Among the items found near the earthworks in Ohio are fossilized shark’s teeth that either came from the Gulf Coast or a southern part of the East Coast. Copper and silver used in jewelry was mined in the northern Great Lakes region. The collection includes mirrors made from mica, a mineral commonly found in the Appalachian Mountains. Spear points found in the region were made of obsidian, a volcanic glass that has been traced to what is today Yellowstone National Park in Montana, more than 2,400 kilometers (1,500 miles) away.

    Brad Lepper, curator of archaeology at the Ohio Historical Society in Columbus, says there is reason to believe the Hopewell did not acquire the obsidian through trade.

    “The obsidian is really interesting, because if it were from trade from village to village, you would expect there to be a trail of obsidian from Montana to Ohio,” he says. “And there really isn’t.”

    Nor is there evidence of the region being a trade hub, where goods are collected and redistributed, he says.

    The artifacts were amassed somehow, however, and archaeologists have come up with a theory.

    Hopewell Interaction Sphere

    Rather than calling this ancient system a trade network, archaeologists who study the relationship between the Hopewell people and other far-flung cultures of the time call it the Hopewell Interaction Sphere.

    Bret Ruby, an archaeologist at Hopewell Culture National Historic Park in Chillicothe, Ohio, says the term describes the long-distance sharing of certain artifact styles and raw materials, including copper, mica, and marine shells.

    “These things are moving over the whole eastern U.S., but it is not necessarily a trade network,” he says. “In fact, in a number of cases, we can show it wasn’t trade.”

    So how did all of these exotic objects end up with the Hopewell? There are two theories.

    “A lot of what people had traditionally called trade is probably direct procurement,” Ruby says. “It’s people going out from Ohio and bringing these exotic things back.”

    The other theory has to do with the mounds and walls that dot the Ohio River Valley. The monumental structures were arranged in various shapes and in some cases covered hundreds of acres.

    “Another thing that could be going on is that these big earthwork centers in Ohio were probably widely known,” Ruby says. “They were built over a period of hundreds of years. They are awesome to see, so people knew about them. It’s also likely people went as pilgrims from distant places to Ohio to visit these great religious centers,” bringing the objects with them.

    Lepper agrees with the second theory.

    “I think that during the Hopewell era in the Middle Woodland period, Ohio was this nexus, this cultural center for much of eastern North America,” he says.

    Lepper notes that there have been small amounts of flint from Flint Ridge in Newark, Ohio, found in Pinson Mounds, Tennessee. He believes this is further evidence of the Ohio earthworks being pilgrimage sites.

    “For me, the interpretation of that is that these massive offerings of thanksgiving or supplication are being brought to Newark, and what people are taking away are pilgrim’s tokens,” he says.

    Lepper even has some ideas on how the Hopewell or pilgrims visiting them might have traveled.

    “In terms of evidence, I don’t think we have identified any definitive Hopewell roads,” Lepper says. “But we have identified sources of raw material and endpoints. They could have either followed a direct overland route, which is unlikely. Or they could have followed streams. You could just jump on the Missouri River and go to the Mississippi River then go up the Ohio River and Scioto River, and you’d be there in less time and less effort.”

    Ruby says the existence of the Hopewell Interaction Sphere might correct a misconception about ancient cultures like the Hopewell.

    “I think it’s good for people to know that there were these continent-spanning journeys happening, that people weren’t isolated,” he says. “We have this picture that people were isolated in little villages, not in contact. In fact, there is all this evidence that for thousands of years, people were moving and in contact with one another.”

    Intriguing Interactions

    The Hopewell tradition stretched from the Rocky Mountains to the Atlantic Ocean.

    Hopewell Habitat
    Although [the Hopewell] lived in scattered little villages all over the place, they did gather periodically at these amazing earthwork centers like the Newark Earthworks or Fort Ancient or Mound City. Chillicothe seems to have been the center of this.
    Brad Lepper, curator of archaeology at the Ohio Historical Society

    Capitol City
    Chillicothe is a Shawnee word that means "principal town." The present-day Ohio city was once a center for Hopewell culture.

    What's in a Name?
    The term Hopewell is derived from Mordecai Cloud Hopewell, who owned a farm where earthworks were excavated in the 1890s.

  • Term Part of Speech Definition Encyclopedic Entry
    accumulation Noun

    a buildup of something.

    acquire Verb

    to get or take possession of.

    amass Verb

    to gather.

    ancient Adjective

    very old.

    archaeologist Noun

    person who studies artifacts and lifestyles of ancient cultures.

    artifact Noun

    material remains of a culture, such as tools, clothing, or food.

    Encyclopedic Entry: Artifact
    continent Noun

    one of the seven main land masses on Earth.

    Encyclopedic Entry: continent
    copper Noun

    chemical element with the symbol Cu.

    curator Noun

    person who designs, assembles, and manages an exhibit at a museum or other cultural center.

    earth Noun

    soil or dirt.

    earthwork Noun

    constructed mound, wall, or other feature made of soil.

    exotic Adjective

    foreign or strange.

    far-flung Adjective

    spread over a great distance.

    flint Noun

    hard stone that sparks when struck with steel.

    fossilize Verb

    to become a solid mineral.

    Great Lakes Noun

    largest freshwater bodies in the world, located in the United States and Canada. Lake Huron, Lake Ontario, Lake Michigan, Lake Erie, and Lake Superior make up the Great Lakes.

    Hopewell Noun

    (500 BCE-200 CE) people and cultures of a trading network in the Mississippi and Ohio Valleys of North America.

    Hopewell Interaction Sphere Noun

    exchange network surrounding a nexus in southern Ohio, stretching to the East and Gulf coasts and the Rocky Mountains.

    jewelry Noun

    ornaments and decorations worn on the body.

    marine Adjective

    having to do with the ocean.

    massive Adjective

    very large or heavy.

    mica Noun

    type of mineral that can be split into thin, see-through sheets.

    Middle Woodland adjective, noun

    (380 BCE-500 CE) time period in the development of eastern Native American cultures.

    mine Verb

    to extract minerals from the Earth.

    mineral Noun

    inorganic material that has a characteristic chemical composition and specific crystal structure.

    misconception Noun

    misunderstanding or false statement.

    nexus Noun

    central region or hub.

    obsidian Noun

    black glass formed as lava cools above ground.

    pilgrim Noun

    person who travels to a place for a religious or spiritual reason.

    procure Verb

    to get, buy, or obtain.

    raw material Noun

    matter that needs to be processed into a product to use or sell.

    region Noun

    any area on Earth with one or more common characteristics. Regions are the basic units of geography.

    Encyclopedic Entry: region
    religion Noun

    a system of spiritual or supernatural belief.

    reside Verb

    to live in a place.

    silver Noun

    chemical element with the symbol Ag.

    stream Noun

    body of flowing fluid.

    supplication Noun

    act of religious humility or prayer.

    token Noun

    material, usually similar to a coin, that may be exchanged for specific goods or services.

    trade Noun

    buying, selling, or exchanging of goods and services.

    village Noun

    small human settlement usually found in a rural setting.

    Encyclopedic Entry: village
    volcanic Adjective

    having to do with volcanoes.