Reading Maps, Timelines & Historical Change · Grade 7 Social Studies

Part 1 · One founding, three answers

Haudenosaunee oral tradition records the founding in detail: the Peacemaker travelled among five warring nations — Mohawk, Oneida, Onondaga, Cayuga and Seneca — and persuaded them to bury their weapons under a white pine. The tradition includes a sign in the sky, a darkening of the sun, at the moment the last holdout agreed.

In 1997 two researchers, Barbara Mann and Jerry Fields, argued that the darkening was a total solar eclipse and worked backwards through the astronomy. An eclipse crossed Haudenosaunee territory on 31 August 1142, and they proposed that as the founding date. The reasoning is checkable: eclipse paths can be computed precisely for thousands of years.

Most archaeologists put the founding far later, somewhere between about 1450 and 1600. Their evidence is in the ground. Iroquoian villages of the earlier period are heavily fortified with timber palisades, which is what communities build when they fear their neighbours; the fortifications thin out in the later 1400s and 1500s, which is what you would expect once the neighbours stop being enemies. A third group reads the first European accounts and argues for the 1570s.

Part 2 · What a date is actually resting on

Every date you meet rests on one of a few kinds of evidence, and they are not equally precise. A dated document is the strongest: a treaty signed on 3 September 1783 was signed that day. Astronomy is precise but needs an assumption to connect it to the event. Archaeology gives ranges — radiocarbon dating returns a span, not a year. Oral tradition preserves order and meaning reliably over long periods but is not built to carry calendar dates, because it was never meant to.

So the honest way to write the Confederacy's founding is not to pick a number and move on. It is to say: founded before European contact, by a process the Haudenosaunee themselves record in detail, at a date disputed between about 1142 and about 1600, with the evidence pulling in different directions. That sentence is longer and less satisfying than “1142”. It is also true.

Watch for this when a textbook gives you a suspiciously round or suspiciously confident number for anything before written records. The confidence usually belongs to the printing, not to the evidence.

Part 3 · A map is an argument

John Mitchell published his map of North America in 1755, before the French and Indian War. It was the best available, and in 1782 and 1783 the American and British negotiators in Paris spread it on the table and drew the new country's boundaries on it. A copy with their markings survives.

The map was wrong in places, and the errors became the border. It misplaced the source of the Mississippi, which left the northwestern boundary describing a line that could not exist on the ground. Disputes over what the 1783 text meant — traced on a map drawn twenty-eight years earlier by a man who had never seen most of the country — were still being settled in the 1842 Webster–Ashburton Treaty, nearly sixty years later.

Mitchell's map also did what most European maps of the period did: it showed Native nations where it was convenient and left vast inhabited regions looking blank or merely labelled. Empty space on a map is not evidence of empty land. It is evidence of what the mapmaker knew, or wished to assert, about who had a claim.

That omission had a purpose. Mitchell drew his map for the Board of Trade in London, and it was designed to support British claims against French ones — which is why British territory runs generously westward across country no British official had surveyed. When the negotiators of 1783 divided North America between Britain and the new United States using that sheet, the Haudenosaunee and every other nation living on the land were not in the room and are barely on the paper. Within eleven years the Confederacy was negotiating the Treaty of Canandaigua in 1794 over ground that two European-descended powers had already assigned to each other.

Part 4 · Reading both without being fooled

Three habits will carry you through the rest of the course. First, ask what a date rests on, and accept a range when the evidence only supports a range. Second, ask what a map leaves out, and who benefits from the omission. Third, notice that spacing on a timeline is a design choice: a timeline with 1763, 1776 and 1783 evenly spaced hides that the first gap is thirteen years and the second is seven.

These are not reasons to distrust maps and timelines. They are the reasons to use them properly. A timeline is excellent at showing order, which is what you need when deciding whether one thing could have caused another — an event cannot be caused by something that happened after it. A map is excellent at showing distance and terrain, which is why the Erie Canal's route makes sense the moment you see where the Appalachians stop.

Use each for what it is good at, and ask what it is quietly asserting. You will do both in every chapter from here.

Neither the dating problem nor the map error is a reason to give up on dates and maps. Both are tools you will use constantly, and both work better once you know what they can and cannot carry. The point is to ask, every time, what a number or a line is actually resting on.

One last habit, which costs nothing: check the date of the map itself, not just the date of the thing it shows. A map printed in 1850 showing the colonies in 1750 is a nineteenth-century argument about the eighteenth century, and it will quietly carry what people in 1850 believed. The Mitchell Map is the sharpest example in this course of why that matters — a 1755 sheet still setting borders in 1783 and still being argued over in 1842.