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Social studies activity

Missouri's Story: The Gateway Arch, Lewis & Clark & Mark Twain

The Gateway Arch in St. Louis, Missouri, is 630 feet tall — that is taller than the Washington Monument, taller than the Statue of Liberty with her base, and taller than any building in St. Louis itself! Here is the most surprising part: it is exactly as tall as it is wide. The arch is a perfect mathematical shape called a catenary curve — the same curve a chain makes when you hold both ends and let it hang.

Hands OnAbout 25 minutesScreen-freeParent help expected

Materials and setup

How this changes by age

Pre-K (ages 3–4)

The Gateway Arch in St. Louis, Missouri, is 630 feet tall — that is taller than the Washington Monument, taller than the Statue of Liberty with her base, and taller than any building in St. Louis itself! Here is the most surprising part: it is exactly as tall as it is wide. The arch is a perfect mathematical shape called a catenary curve — the same curve a chain makes when you hold both ends and let it hang.

Difficulty 1 of 3

Steps

  1. Hold a necklace or piece of string by both ends and let the middle hang down. Look at the curve it makes!
  2. Now flip that curve upside down in your head — that is what the Gateway Arch looks like.
  3. Draw the arch on your paper, making it as tall as your whole page.
  4. Color it silver. Draw tiny stick people at the bottom to show how enormous the arch is compared to a person.

Learning objectives

  • Recognize the Gateway Arch as the tallest monument in the United States at 630 feet
  • Wonder at the mathematical idea that a hanging chain and a giant arch share the same curve
  • Notice scale — how a building can make people look tiny

Kindergarten (ages 5–6)

Lewis and Clark set out from St. Louis in 1804 — but here is something most people do not know: a woman named Sacagawea was not just their guide. She was a Shoshone woman who had been separated from her people as a child. Lewis and Clark met her when she was 16 and pregnant. Without her, they would never have gotten horses from the Shoshone people to cross the Rocky Mountains — and the whole expedition might have failed. She carried her baby the whole way.

Difficulty 2 of 3

Steps

  1. Draw the Lewis and Clark expedition: a canoe on a wide river with mountains in the background.
  2. Draw Sacagawea in the front of the canoe, pointing the way. Draw her baby on her back in a carrier.
  3. Draw horses on the shore — the horses her people gave them to cross the mountains.
  4. Write or dictate: 'Without Sacagawea, Lewis and Clark could not have ___.'
  5. Ask: 'How do you think Sacagawea felt traveling back toward the land where she had grown up?'

Learning objectives

  • Identify Sacagawea's specific contributions — not just 'guide' but translator, diplomat, and provider of horses
  • Understand Sacagawea's full story and her remarkable journey
  • Recognize that the success of a famous American expedition depended on a teenage Shoshone mother

Early elementary (ages 6–8)

The Gateway Arch was engineered so precisely that when the two legs were joined at the top in 1965, they fit together within 1/64th of an inch — about the width of a matchstick — after each leg was built separately from the ground up. Missouri itself was at a crossroads in American history: in 1820 Congress drew a line on a map of the country, deciding which new states would allow slavery and which would not — this was called the Missouri Compromise. For 34 years it held the country together. Then it fell apart. Mark Twain, who grew up in Hannibal, Missouri, watching life on the great river, put it all into two boys on a raft — one white, one Black — floating down the Mississippi.

Difficulty 2 of 3

Steps

  1. Create a Missouri timeline: 1804 Lewis and Clark depart St. Louis; 1820 Missouri Compromise — Congress draws a line on the map; 1835 Mark Twain born in Hannibal; 1965 Gateway Arch completed within 1/64 inch.
  2. Write two sentences about Mark Twain's novel 'Huckleberry Finn': What real Missouri experience was he writing about? Why does the Mississippi River matter to the story?
  3. Draw the Gateway Arch with the Mississippi River labeled. Add a matchstick next to the arch's top to show how precise the fit was.
  4. Write a paragraph: Why was Missouri called a 'crossroads state' in the 1800s — geographically AND politically?
  5. Underline the most surprising fact in your paragraph.

Learning objectives

  • Explain the Missouri Compromise as Congress drawing a line on a map to decide which new states would allow slavery
  • Connect Mark Twain's childhood on the Mississippi to the themes in his writing
  • Describe the engineering precision of the Gateway Arch with a specific measurement
  • Analyze Missouri's position as a geographic and political crossroads

Upper elementary (ages 8–10)

The Missouri Compromise of 1820 drew a line across the map at 36°30' latitude: slavery allowed south of it, banned north of it. Politicians celebrated it as a masterpiece of compromise. Henry Clay was called 'The Great Compromiser.' But here is what they actually did: they delayed the conflict instead of solving it. The compromise held for 34 years, then collapsed with the Kansas-Nebraska Act of 1854, and the Civil War began six years later. Missouri itself — a state on the border — became a place of intense disagreement during the Civil War, with neighbors choosing different sides and communities deeply divided. The question for you: was the Missouri Compromise wise or cowardly? Does delaying a moral crisis count as leadership?

Difficulty 3 of 3

Steps

  1. Research the Missouri Compromise: What was the 36°30' line? What two states were admitted together, and why? Who was Henry Clay and what did he believe?
  2. Read about Missouri during the Civil War: Why was the Missouri-Kansas border a place of such intense disagreement? What did Missouri families experience when neighbors chose different sides?
  3. Create a cause-and-effect diagram: Missouri Compromise (1820) → Kansas-Nebraska Act (1854) → Bleeding Kansas → Civil War (1861).
  4. Write a persuasive paragraph (5–7 sentences): Was the Missouri Compromise an act of wise leadership or moral cowardice? Use at least two specific facts. Acknowledge the strongest argument on the other side.
  5. Find one Mark Twain quote about the South, the river, or human nature and explain what it reveals about growing up in Missouri.
  6. Share your diagram and argument with a family member and hold a structured debate.
  7. Lewis and Clark left St. Louis in 1804 with a budget Congress approved for about $2,500, though the trip ended up costing close to $38,000. Look up what $38,000 in 1804 would be worth today (estimate). If you were pitching the expedition to investors, list three things they might gain in return and decide what percentage of profits you would offer backers.
  8. The Gateway Arch is 630 feet tall and shaped like a curve called a catenary. Draw the arch on paper, then build a mini version using a chain or string held at both ends to see the natural catenary curve. Measure your curve's height and width and write the ratio, then compare it to the real arch's 1 to 1 ratio.

Learning objectives

  • Trace the causal chain from the Missouri Compromise to the Civil War using specific events and dates
  • Evaluate whether delaying a moral crisis through political compromise is wise or harmful
  • Analyze Missouri's unique position as a border state during the Civil War
  • Write a persuasive argument that acknowledges and rebuts a counterargument

Safety and evidence note

Read the full activity before beginning. An adult should supervise tools, heat, food, outdoor work, movement, and experiments as appropriate. Completion records that the activity was done; the child’s explanation, work sample, photo, or demonstration is stronger evidence of learning than a completion check alone.

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