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In 1783 the United States was a strip along one coast. By 1867 it was almost exactly the shape on today's map. Almost none of that was done by walking — it was done with signatures.
Find a map of the United States in 1783 and it looks wrong. There is a ragged strip down the Atlantic coast reaching back to the Mississippi River, and then nothing — the rest of the continent belongs to Spain, France, Britain, Russia and to the Native nations who had lived there for thousands of years.
That strip was about 892,000 square miles. The country today covers roughly 3.8 million. So more than three-quarters of the modern map arrived after independence.
And here is the surprising part: nearly all of it arrived in an 84-year window, between 1783 and 1867, and every single piece of it arrived as a document. A treaty, a purchase, or an act of Congress — with a date, a signature and usually a price.
The picture in most people's heads is a slow tide: families in wagons, moving west, and the country growing to fit them.
People certainly moved west, in enormous numbers, and the movement mattered. But the movement did not draw the border. Look at the northern boundary on a map — from Minnesota to Washington it is a dead-straight line. Nobody walks a straight line across a continent. That line is the 49th parallel, and it is there because two governments agreed on it in an office in Washington in 1846.
The map is not a record of where people went. It is a record of what was signed.
Eight moments, each of which changed the outline. Tap them into the order they happened, then read what each one actually was. Notice how few of them there are for the amount of ground they cover.
Tap whichever you think happened next
Two pieces are missing from that list because they are small, and both are worth a line.
The Gadsden Purchase of 1854 bought about 29,670 square miles from Mexico for $10 million — a strip along the southern edge of what is now Arizona and New Mexico, wanted mainly because it was flat enough for a southern railroad route. It is the last piece of the contiguous United States to be acquired.
Hawaii was annexed by a joint resolution of Congress in 1898 — about 6,450 square miles, two thousand miles offshore, and the only part of the fifty states that was an independent kingdom within living memory of people alive when it joined.
The border between the United States and Canada runs dead straight for hundreds of miles across the west. What explains a border that straight?
Read back through those eight entries and you will find only four mechanisms, used over and over:
Purchase. Money for territory, between governments. Louisiana in 1803, the Gadsden strip in 1854, Alaska in 1867. A purchase is a treaty, so each needed two-thirds of the Senate.
Treaty settling a claim. No conquest and often no money — two countries with overlapping claims agree where the line is. Florida in 1819, Oregon in 1846.
War, ended by treaty. The Mexican Cession in 1848 came out of the Mexican-American War, and it still took a signed treaty and a Senate vote to transfer anything. The United States also paid $15 million.
Annexation by act of Congress. Texas in 1845 and Hawaii in 1898. Both were done by joint resolution rather than by treaty, which needs only simple majorities in each chamber instead of two-thirds of the Senate — and in both cases that difference was the point, because the two-thirds was not there.
Notice what is doing the work in all four. Every one of them ends in a document that somebody had to vote on.
A treaty needs two-thirds of the Senate. A joint resolution needs a simple majority in each chamber. Texas and Hawaii both joined the country by the second route after the first route was out of reach.
Texas and Hawaii were both brought in by joint resolution instead of by treaty. What practical difference did that make?
Every square mile in that timeline was described in the documents as being transferred between governments. None of it was empty.
Here is that side of the story in the same currency as the rest of this episode — countable things with dates on them.
Between 1778 and 1871, the United States negotiated and the Senate ratified around 370 treaties with Native nations. (Sources count slightly differently, between about 368 and just under 400, depending on what is included; the scale is not in dispute.) Those treaties are law. Many of them were later broken, altered without consent, or superseded by an act of Congress — and hundreds of the resulting disputes have been litigated in American courts, some of them within the last few decades.
On May 28, 1830 President Andrew Jackson signed the Indian Removal Act, which authorised the government to exchange land west of the Mississippi for Native nations' land in the east. It passed the House 102 to 97 — a five-vote gap, which tells you it was fiercely contested at the time and not a national consensus. The forced removals that followed, of the Cherokee, Choctaw, Creek, Chickasaw and Seminole among others, killed thousands of people on the journeys.
On March 3, 1871 Congress ended treaty-making with Native nations altogether by attaching a clause to an appropriations act. Existing treaties stayed in force; no new ones could be made. After that, the relationship was governed by acts of Congress rather than by agreements between nations.
Those are all dates and counts. Two things in this area genuinely are argued rather than counted, and it is worth naming which: historians disagree about how much of the expansion was driven by a national idea versus ordinary economics, and there is a real, live disagreement about what the whole sequence of events should be called. What is not argued is that the land in the timeline had people on it, that agreements were made with those people, and that many of those agreements were not kept.
Look at the last entry on the timeline again. Alaska was bought in 1867 and became a state in 1959 — a gap of 92 years.
That gap is the normal case, not an oddity. Land acquired by the United States becomes a territory, governed under rules Congress writes, and the people living in a territory do not have the same representation as people in a state. Turning a territory into a state is a separate act of Congress, and Congress has no obligation to perform it.
The pattern goes back to the Northwest Ordinance of 1787, passed before the Constitution existed. It laid out a staged path: Congress appoints a governor and judges; once the territory has 5,000 free adult men it may elect its own legislature; at 60,000 it may write a constitution and apply for statehood. Some later territories waited decades between application and admission, and some applied more than once.
So the map has two layers. The outline was essentially finished in 1867. The fifty states inside it took until 1959.
Alaska was American territory from 1867 but did not become a state until 1959. What was true of it during those 92 years?
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Areas of United States territorial acquisitions: original territory recognised in 1783, 892,135 sq mi; Louisiana Purchase 1803, 827,987 sq mi; Texas annexation 1845, 389,166 sq mi; Oregon Country 1846, 286,541 sq mi; Mexican Cession 1848, 529,189 sq mi; Gadsden Purchase 1854, 29,670 sq mi; Alaska 1867, about 591,000 sq mi; Hawaii 1898, 6,450 sq mi (United States territorial acquisitions table, compiled from U.S. government sources; Ballotpedia, 'United States territorial acquisitions'). Total area of the United States is about 3.8 million square miles (U.S. Census Bureau, State Area Measurements). Louisiana Purchase: treaty signed April 30, 1803; the United States paid $15 million to France (National Archives, Milestone Documents; Office of the Historian, U.S. Department of State). Adams-Onís Treaty: signed February 22, 1819; ratifications exchanged February 1821. Spain ceded Florida; the United States relinquished its claim to Texas and assumed up to $5 million in claims by its own citizens against Spain (Office of the Historian, U.S. Department of State, 'Acquisition of Florida'). Texas: annexed by joint resolution signed March 1, 1845; admitted as a state December 29, 1845. A joint resolution requires simple majorities in both chambers, unlike a treaty, which requires two-thirds of the Senate (U.S. House of Representatives, History, Art & Archives, 'Joint Resolution Annexing Texas'; Texas State Library). Oregon Treaty: signed June 15, 1846, ending 28 years of joint British-American occupation and setting the boundary at the 49th parallel (Oregon Encyclopedia; The Canadian Encyclopedia). Treaty of Guadalupe Hidalgo: signed February 2, 1848, ending the Mexican-American War; the United States paid $15 million for the Mexican Cession (National Archives, Milestone Documents). Gadsden Purchase: treaty signed December 30, 1853 and ratified in 1854; 29,670 sq mi for $10 million (Office of the Historian, U.S. Department of State). Alaska Purchase: treaty signed March 30, 1867; $7.2 million paid to Russia (National Archives; Office of the Historian). Hawaii was annexed by the Newlands Resolution, a joint resolution of Congress signed July 7, 1898, after a treaty of annexation failed to reach two-thirds in the Senate (Library of Congress; Office of the Historian). Alaska was admitted as the 49th state on January 3, 1959 and Hawaii as the 50th on August 21, 1959 (National Archives; Library of Congress). Between 1778 and 1871 the United States ratified roughly 370 treaties with Native nations — sources give figures between about 368 and just under 400 depending on what is counted (Library of Congress, 'American Indian Law: Treaties'; National Museum of the American Indian, '1871: The End of Indian Treaty-Making'). The Indian Removal Act was signed by President Andrew Jackson on May 28, 1830; it passed the House of Representatives 102 to 97 (Library of Congress; U.S. House of Representatives, History, Art & Archives). On March 3, 1871 Congress ended treaty-making with Native nations via a clause in the Indian Appropriations Act; existing treaties remained in force (National Museum of the American Indian; Records of Rights, National Archives). Northwest Ordinance, adopted July 13, 1787: a staged path to statehood — a governor, secretary and three judges appointed by Congress; an elected legislature once the territory had 5,000 free adult males; application for statehood at 60,000 (U.S. House of Representatives, History, Art & Archives; Library of Congress). Congress has the sole authority to admit new states, by an act of admission (Article IV, Section 3 of the Constitution).