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Parallel 36°30′ north

Parallel 36°30′ north is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Parallel 36°30′ north rather than just read about it. In short: The parallel 36°30′ north (pronounced 'thirty-six degrees and thirty arcminutes') is a circle of latitude that is 36+1⁄2 degrees north of the equator of the Earth. This parallel of latitude is particularly significant in the history of the United States as the line of the Missouri Compromise, which was used to divide the prospective slave and free states west of the Mississippi River, with the exception of Missouri…

Parallel 36°30′ north — main illustration
Parallel 36°30′ north — illustration

Key takeaways

  • Parallel 36°30′ north belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Parallel 36°30′ north to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Parallel 36°30′ north from memory before moving on to harder problems.

Reference excerpt

The parallel 36°30′ north (pronounced 'thirty-six degrees and thirty arcminutes') is a circle of latitude that is 36+1⁄2 degrees north of the equator of the Earth. This parallel of latitude is particularly significant in the history of the United States as the line of the Missouri Compromise, which was used to divide the prospective slave and free states west of the Mississippi River, with the exception of Missouri, which is mostly north of this parallel. The line continues to hold cultural, economic, and political significance to this day; the Kinder Institute for Urban Research defines the Sun Belt as being south of 36°30′N latitude.

In colonial America The parallel was the Royal Colonial Boundary of 1665.

In the United States In the United States, the parallel 36°30′ forms part of the boundary between Tennessee and Kentucky, in the region west of the Tennessee River and east of the Mississippi River. This parallel also forms part of the boundary between Missouri and Arkansas in the region west of the St. Francis River, and part of the boundary between the Oklahoma Panhandle and the Texas Panhandle. The rest of the boundaries between Virginia and North Carolina; between Virginia and Tennessee; and between Tennessee and Kentucky lie close to the parallel 36°30′. The boundary between Kentucky and Tennessee was defined as 36°30′, based on the Royal Colonial Boundary of 1665 that set the boundary of the Colony of Virginia and the Province of Carolina. In 1779 and 1780, surveyors were sent to mark the line on the ground as far as the Tennessee River. As they worked west their line drifted north until by the time they reached the river they were about 10′ north of 36°30′. Despite this error the boundary was set along the line surveyed. The final part of the Kentucky-Tennessee boundary, between the Tennessee River and the Mississippi River, was not surveyed until after 1819 when treaties extinguished Native American claims in the area. The final portion was surveyed east from the Mississippi River along 36°30′. Due to the relative precision of the survey of 36°30′ on the Mississippi River, Congress decided to continue the line west as the northern boundary of Arkansas Territory, with the exception of the Missouri Bootheel. The parallel 36°30′ north is part of a nearly straight east–west line of state borders (with small variations) starting on the East Coast of the United States, beginning with the border between Virginia and North Carolina. However, this boundary and the one between Kentucky and Tennessee lie a few miles north of 36°30′ in places. The line west of Arkansas is slightly further north at 37°. In southeastern Missouri, the Missouri Bootheel along the Mississippi River extends about 50 miles (80 kilometers) to the south, all the way to the 36th parallel north, and about 30 miles (50 kilometers) inland. This was because politicians in that region along that major river felt that it would be advantageous to be located in Missouri rather than in the Arkansas Territory, which became the State of Arkansas in 1836. The parallel 36°30′ then forms the rest of the boundary between Missouri and Arkansas. The Missouri Compromise of 1820 established the latitude 36°30′ as the northern limit for slavery to be legal in the territories of the west. As part of this compromise, Maine (formerly a part of Massachusetts) was admitted as a free state. This addition maintained the balance of power in the U.S. Senate between the free states and the slaveholding states. The bulk of Missouri lies north of the 36°30′ line, but Southern planters who lived in southeastern Missouri supported slavery, especially for farming on their cotton plantations. Hence, part of the Missouri Compromise arose from this. Also, the slave states of the Southern United States wanted to have the support of another slave state so the Senate could not abolish slavery in the United States. This situation remained in effect for decades because as the free states of Michigan, Wisconsin, and Iowa were admitted to the Union, the new slave states of Arkansas, Florida, and Texas were also admitted. When the Republic of Texas joined the United States in 1845 as a slave state, it was required to cede all of its claimed land north of the 36°30′ latitude to the Federal Government. Over the following half-century, this land became parts of Kansas, Colorado, New Mexico, and Oklahoma. The Compromise of 1850 confirmed that the 36°30′ parallel was the northmost boundary of Texas. Then Kansas was admitted to the Union as a free state in 1861. The creation of the New Mexico Territory and the Utah Territory in 1850, the Kansas Territory in 1854, and the Colorado Territory in 1861 moved the boundaries of one of the western territories, New Mexico, north to the 37th parallel north. New Mexico Territory was eventually split in two states, New Mexico and Arizona, which were admitted in 1912, but this was long after the 13th Amendment had abolished slavery in all of the United States. The gap between the northern boundary of Texas on the parallel 36°30′ north and the southern boundaries of Kansas and Colorado on the parallel 37° north created the No Man's Land that later became the Oklahoma Panhandle in 1889. While a significant part of Nevada (containing Las Vegas) is south of 36°30′, at the time of the admission of Nevada in 1864, it was in the New Mexico Territory. This land was not split off from the new Arizona Territory until 1871, when it was given to Nevada by the Federal government. The Compromise of 1850 made no attempt to divide California along the line of 36°30′, or to allow slavery south of it; the social and political conditions created by the California Gold Rush ruled out any such idea, and California was admitted to the union as a free state. During the American Civil War (1861–65), all of the states located wholly south of 36°30′ north joined the Confederate States of America. All of the states with land north of the parallel, except Virginia, stayed in the Union, although Kentucky and Missouri had Confederate legislatures that were elected in parallel with their regular legislatures.

Around the world Starting at the Prime Meridian and heading eastwards, the parallel 36°30′ north passes through:

… excerpt ends here. Continue reading the full article.

Illustrations

Parallel 36°30′ north: Map of the United States c. 1849 (modern state borders), with the parallel 36°30′ north—slave states in red, free states in blue
Map of the United States c. 1849 (modern state borders), with the parallel 36°30′ north—slave states in red, free states in blue
Parallel 36°30′ north: This 1856 map shows slave states (gray), free states (pink), U.S. territories (green), and Kansas in center (white) with parallel 36°30′ north prominently indicated.
This 1856 map shows slave states (gray), free states (pink), U.S. territories (green), and Kansas in center (white) with parallel 36°30′ north prominently indicated.
Parallel 36°30′ north illustration

Worked examples

Example 1 — a first encounter with Parallel 36°30′ north

Start with the simplest possible case. Write down what Parallel 36°30′ north claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Parallel 36°30′ north before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Parallel 36°30′ north ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Parallel 36°30′ north

In research
Parallel 36°30′ north appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Parallel 36°30′ north in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Parallel 36°30′ north is common in secondary-school and first-year university syllabi. It links to neighbouring topics Borders of Arkansas, Borders of Kentucky, Borders of Missouri, so understanding it makes those chapters shorter.
In everyday life
Look for Parallel 36°30′ north outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Parallel 36°30′ north in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Parallel 36°30′ north means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Parallel 36°30′ north out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Parallel 36°30′ north in simple terms?

The parallel 36°30′ north (pronounced 'thirty-six degrees and thirty arcminutes') is a circle of latitude that is 36+1⁄2 degrees north of the equator of the Earth. This parallel of latitude is particularly significant in the history of the United States as the line of the Missouri Compromise, which…

Why does Parallel 36°30′ north matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Parallel 36°30′ north?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Parallel 36°30′ north.

Tags

  • Borders of Arkansas
  • Borders of Kentucky
  • Borders of Missouri
  • Borders of Oklahoma
  • Borders of Tennessee
  • Borders of Texas
  • Circles of latitude
  • Historical geography of the United States

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