Toledo War

The Toledo War (1835–1836), also known as the Michigan–Ohio War or Ohio–Michigan War, was a boundary dispute between the U.S. state of Ohio and the adjoining territory of Michigan over what is now known as the Toledo Strip. Control of the Maumee River's mouth and the inland shipping opportunities it represented, and the good farmland to the west, were seen by both parties as valuable economic assets.

Poor geographical understanding of the Great Lakes helped produce conflicting state and federal legislation between 1787 and 1805, and varying interpretations of the laws led the governments of Ohio and Michigan to both claim jurisdiction over a 468-square-mile (1,210 km²) region along their border. The situation came to a head when Michigan petitioned for statehood in 1835 and sought to include the disputed territory within its boundaries. Both sides passed legislation attempting to force the other side's capitulation, and Ohio's Governor Robert Lucas and Michigan's 24-year-old "Boy Governor" Stevens T. Mason helped institute criminal penalties for residents submitting to the other's authority. Both states deployed militias on opposite sides of the Maumee River near Toledo, but besides mutual taunting, there was little interaction between the two forces. The single military confrontation of the war ended with a report of shots being fired into the air, incurring no casualties. The only blood spilled was the non-fatal stabbing of a law enforcement officer.

During the summer of 1836, the United States Congress proposed a compromise whereby Michigan gave up its claim to the strip in exchange for its statehood and the remaining three-quarters of the Upper Peninsula. Although the northern region's mineral wealth later became an economic asset to Michigan, at the time the compromise was considered a poor deal for the new state, and voters in a statehood convention in September soundly rejected it. In December, facing a dire financial crisis and pressure from Congress and President Andrew Jackson, the Michigan government called another convention (called the "Frostbitten Convention"), which accepted the compromise, resolving the Toledo War.

In 1787, the Congress of the Confederation enacted the Northwest Ordinance, which created the Northwest Territory in what is now the upper Midwestern United States. The Ordinance specified that the territory was eventually to be divided into "not less than three nor more than five" future states. One of the boundaries between them was to be "an east and west line drawn through the southerly bend or extreme of Lake Michigan". When Congress passed the Enabling Act of 1802, which authorized Ohio to begin the process of becoming a U.S. state, the language defining Ohio's northern boundary elaborated on that, but was fundamentally the same: "an east and west line drawn through the southerly extreme of Lake Michigan, running east ... until it shall intersect Lake Erie or the territorial line [with British North America, now Canada], and thence with the same through Lake Erie to the Pennsylvania line aforesaid".

The most highly regarded map of the time, the "Mitchell Map", showed the southerly extreme of Lake Michigan at a latitude north of the mouth of the Detroit River, suggesting that an east–west line would not intersect with Lake Erie at all, until well across the international border. The framers of the 1802 Ohio Constitution therefore believed it was the intent of Congress that Ohio's northern boundary should certainly be north of the mouth of the Maumee River, and possibly even of the Detroit River. Ohio would thus be granted access to most or all of the Lake Erie shoreline west of Pennsylvania, and any other new states carved out of the Northwest Territory would have access to only Lakes Michigan, Huron, or Superior.

However, the delegates allegedly received reports from a fur trapper that Lake Michigan extended significantly farther south than had previously been believed (or mapped). Thus, it was possible that an east–west line extending east from Lake Michigan's southern tip might intersect Lake Erie somewhere southeast of Maumee Bay, or worse, might not intersect the lake at all; the farther south that Lake Michigan actually extended, the more land Ohio would lose, conceivably even the entire Lake Erie shoreline west of Pennsylvania.

Addressing this contingency, the Ohio delegates included a provision in the draft Ohio constitution that if this report about Lake Michigan's position was correct, the state boundary line would be angled slightly northeast so as to intersect Lake Erie at the "most northerly cape of the Miami [Maumee] Bay". This provision would guarantee that most of the Maumee River watershed and the southern shore of Lake Erie west of Pennsylvania would fall in Ohio. The draft constitution with this proviso was accepted by the United States Congress, but before Ohio's admission to the Union in February 1803, the proposed constitution was referred to a Congressional committee. The committee's report stated that the clause defining the northern boundary depended on "a fact not yet ascertained" (the latitude of the southern extreme of Lake Michigan), and the members "thought it unnecessary to take it [the provision], at the time, into consideration."

When Congress created the Michigan Territory in 1805, it used the Northwest Ordinance's language to define the territory's southern boundary, disregarding that provision in Ohio's state constitution. This difference, and its potential ramifications, apparently went unnoticed at the time, but it established the legal basis for the conflict that would erupt 30 years later.