10.1 Manifest Destiny & U.S. Indian Policy

Why This Topic Matters on the GED

U.S. History is 20% of the GED Social Studies test, and expansion-era content is one of its most reliable sources of stimulus-based questions. The test loves this era because it produces exactly the kind of source material the Social Studies Practices (the reasoning skills tested alongside content) are built around: 19th-century maps showing territorial growth, population tables comparing tribal land before and after a policy, and short excerpts from removal-era laws or treaties. You are rarely asked to simply recall a date — you are asked to read a map or chart and draw a conclusion about what a policy accomplished or who it harmed.

Manifest Destiny: The Term and the Idea

Manifest Destiny is the belief, popularized in the mid-1800s, that the United States was destined — by God, history, or both — to expand its territory and institutions across the entire North American continent, "from sea to shining sea." Newspaper editor John L. O'Sullivan coined the phrase in an 1845 essay arguing for the annexation of Texas, and it quickly became the era's justification for settlement, war, and the displacement of Native peoples and Mexican citizens already living in the West.

Manifest Destiny was not a law or a single policy — it was a cultural and political ideology that shaped multiple real events:

• Texas Annexation (1845) — the U.S. annexed the independent Republic of Texas, angering Mexico and setting up the war that followed.
• Oregon Trail migration — tens of thousands of settlers moved overland to the Pacific Northwest in the 1840s, reinforcing the U.S. claim to Oregon Territory (settled by treaty with Britain in 1846 at the 49th parallel).
• The Mexican-American War (1846–1848) — fought over the disputed Texas border and U.S. ambitions toward California and the Southwest.
• The Treaty of Guadalupe Hidalgo (1848) — ended the war; Mexico ceded the Mexican Cession (California, Nevada, Utah, most of Arizona, and parts of New Mexico, Colorado, and Wyoming) to the U.S. for $15 million.

Territorial Growth Timeline

A GED map question might show these acquisitions shaded by decade and ask which territory was added as a direct result of a war — the correct answer is the Mexican Cession, not the Gadsden Purchase (a smaller, negotiated purchase for a southern railroad route) or the Louisiana Purchase (acquired peacefully decades earlier from France, not Mexico).

U.S. Indian Policy: Removal, Reservations, and Assimilation

Westward expansion did not happen on empty land — it required displacing Native American nations already living there, and the federal government formalized this displacement through a sequence of policies you should be able to place in order:

1. Indian Removal Act (1830) — signed by President Andrew Jackson, this law authorized the federal government to negotiate (and, in practice, force) the relocation of Native nations living east of the Mississippi River to "Indian Territory" (present-day Oklahoma).
2. Worcester v. Georgia (1832) — the Supreme Court ruled that the Cherokee Nation was a sovereign entity not subject to Georgia's state laws. Jackson's administration did not enforce the ruling, illustrating a key civics concept tested elsewhere on this exam: a Supreme Court decision is only as effective as the executive branch's willingness to carry it out.
3. The Trail of Tears (1838–1839) — the forced march of roughly 16,000 Cherokee to Indian Territory. An estimated 4,000 died from cold, disease, and exhaustion along the way. This is the single most commonly cited statistic for this topic — know the 16,000-to-4,000 relationship, not just the name of the event.
4. Reservation system (mid-to-late 1800s) — as settlement pushed further west after the Civil War, the government confined Plains nations to designated reservations, often after military conflict (the Indian Wars).
5. Dawes Act (1887) — reversed the reservation model's communal land structure by dividing reservation land into individual family allotments, with "surplus" land sold to white settlers. The stated goal was assimilation into individual land ownership and farming; the practical effect was the loss of an estimated 90 million acres of tribal land by the 1930s.

Common Trap

Test-writers sometimes pair a 19th-century Indian-policy question with 20th-century civil rights vocabulary to see if you confuse eras. Removal, reservations, and the Dawes Act are all 19th-century economic and territorial policy, not civil-rights-era legislation — keep this era distinct from the 1960s movements covered in Chapter 11.

Exam Scenario

A passage describes the Indian Removal Act and asks: "Based on the passage, what was the primary justification the federal government gave for the policy?" The correct answer will reflect the stated 1830s rationale (opening land for settlement, moving tribes out of state jurisdiction) rather than a modern judgment about the policy's morality — GED reading-comprehension items ask what a source says, not what you think about it.