The 1961 theme is the Dakota Territorial Centennial, with the pictures including the Lewis and Clark expedition, the first river steamboat, the 1876 gold rush, a little red schoolhouse on the prairie, and today's construction of large Missouri River reservoirs.

Carnegie, through Keystone, supplied the steel for and owned shares in the landmark Eads Bridge project across the Mississippi River at St. Louis, Missouri ( completed 1874 ).

* 1805 – Lewis and Clark Expedition: The Corps of Discovery breaks camp among the Mandan tribe and resumes its journey West along the Missouri River.

Located among small tributary valleys of the Missouri River, Columbia is roughly equidistant from St. Louis and Kansas City.

He worked hard for the Platte Purchase, which extended the northwestern boundary of Missouri to the Missouri River in 1837.

In September 1861, Atchison led 3, 500 State Guard recruits across the Missouri River to reinforce Price, and defeated Union troops that tried to block his force in the Battle of Liberty.

East St. Louis, sitting across the Mississippi River from the more prosperous St. Louis, Missouri, had entire neighborhoods burned out in 1976 during a massive urban fire.

Granite was used for setts on the St. Louis, Missouri | St. Louis Mississippi River | riverfront and for the piers of the Eads Bridge ( background )

In Native American mythology, it is said that the ancestors of the Mandan people in ancient times emerged from a subterranean land through a cave at the north side of the Missouri River.

This hellbender subspecies inhabits the White River and Spring River systems in southern Missouri and northern Arkansas, and its population has declined an estimated 75 % since the 1980s, with only about 590 individuals remaining in the wild.

* 1805 – Lewis and Clark Expedition: scouting ahead of the expedition, Meriwether Lewis and four companions sight the Great Falls of the Missouri River.

Genevieve, Missouri, the first European settlement west of the Mississippi River.

That summer he met John C. Frémont on a Missouri River steamboat.

The first documented European visit to Kansas City was Étienne de Veniard, Sieur de Bourgmont, who was also the first European to explore the lower Missouri River.

In order to clear his name, he wrote " Exact Description of Louisiana, of Its Harbors, Lands and Rivers, and Names of the Indian Tribes That Occupy It, and the Commerce and Advantages to Be Derived Therefrom for the Establishment of a Colony " in 1713 followed in 1714 by " The Route to Be Taken to Ascend the Missouri River.

" In the documents he describes the junction of the " Grande Riv des Cansez " and Missouri River, being the first to refer to them by those names.

The Spanish took over the region in the Treaty of Paris ( 1763 ), but were not to play a major role in the area other than taxing and licensing all traffic on the Missouri River.

Then in 1834, McCoy established Westport Landing on a bend in the Missouri River to serve as a landing point for West Port.

The boundary lines at that time extended from the middle of the Missouri River south to what is now Ninth Street, and from Bluff Street on the west to a point between Holmes Road and Charlotte Street on the east.

The selection of the city over Leavenworth, Kansas, for the Hannibal & St. Joseph Railroad bridge over the Missouri River brought about significant growth.

Many also went north of the Missouri River, where Kansas City had incorporated areas between the 1940s to 1970s.

Kansas City lies in the Midwestern United States, as well as near the geographic center of the country, at the confluence of the second largest river in the country, the Missouri River, and the Kansas River ( also known as the Kaw River ).

Lewis and Clark stayed separated until they reached the Yellowstone and Missouri Rivers on August 11, along with Clark's.

The Crow, also called the Apsáalooke in their own Siouan language, or Absaroka, are a federally recognized tribe of Native Americans who in historical times lived in the Yellowstone River valley, which extends from present-day Wyoming, through Montana and into North Dakota, where it joins the Missouri River.

Their tribal territory stretched from what is now Yellowstone National Park and the headwaters of the Yellowstone River ( E-chee-dick-karsh-ah-shay —" Elk River ") in the west, north to the Musselshell River, then northeast to the Yellowstone's mouth at the Missouri River, then southeast to the confluence of the Yellowstone and Powder Rivers ( Bilap chashee —" Powder River " or " Ash River "), south along the South Fork of the Powder River, confined in the SE by the Rattlesnake Mountains and westwards in the SW by the Wind River Range.

They lived along the Yellowstone and Musselshell rivers south of the Missouri River and in the river valleys of the Big Horn, Powder and Wind rivers, ( historically known as the Powder River Country ), sometimes traveling north up to the Milk River.

Companies C, D, and I of the 6th U. S. Infantry, moved along the Yellowstone River from Fort Buford on the Missouri River to set up a supply depot, and joined Terry on May 29 at the mouth of the Powder River.

The confluence of the Yellowstone River with the Missouri is west of Williston.

A dam was built on the river south of Glendive, which diverted water from the river into a main canal, which runs north-south, parallel to the Yellowstone, irrigating land from Glendive north up to Fairview, where it dumps into the Missouri River.

Associated with this is a remarkable group of geysers and hot springs in Yellowstone National Park from which the Yellowstone River, a branch of the Missouri, flows northeastward, and the Snake River, a branch of the Columbia, flows southwestward.

Often venturing out alone like John Colter, notably to the headwaters of the Big Horn River from the Yellowstone and around the Three Forks of the Missouri.

The American paddlefish ( Polyodon spathula ) is currently known from the Mississippi River watershed in the United States, including slow-flowing waters of the Mississippi River itself, as well as various tributaries including the Missouri River, Ohio River, Yellowstone River, Wisconsin River, Des Moines River, and Arkansas River systems.

On the first expedition, which departed in April 1807, Lisa and his company of 42 men moved up the Missouri until they reached the mouth of the Yellowstone River.

Major Stephen Harriman Long ( 1784 – 1864 ) led the Yellowstone and Missouri expeditions of 1819-1820, but his categorizing in 1823 of the Great Plains as arid and useless led to the region getting a bad reputation as the " Great American Desert ", which discouraged settlement in that area for several decades.

Adult paddlefish migrations in relation to spring river conditions of the Yellowstone and Missouri rivers, Montana and North Dakota, USA.

After the expedition, Drouillard became a partner in Manuel Lisa's fur-trading ventures on the upper Missouri and Yellowstone Rivers.

He made four expeditions, two to the Plains tribes of Kansas and Nebraska, and two more up the Missouri River past Yellowstone.

The Yellowstone River ( Assiniboine: ȟeȟága wakpá, įǧų ́ ǧa wakpá, į ́ yąǧi wákpa ) is a tributary of the Missouri River, approximately long, in the western United States.

Considered the principal tributary of the upper Missouri, the river and its tributaries drain a wide area stretching from the Rocky Mountains in the vicinity of the Yellowstone National Park across the mountains and high plains of southern Montana and northern Wyoming.

The army ferried its survivors down the Yellowstone to Fort Abraham Lincoln on the Missouri River.

* HBC Brandon House established on the Assiniboine River, outpost for trade south and southwest to Missouri and Yellowstone.

William Clark's Track Map produced after the expedition in 1814 indicates a tributary of the Yellowstone River named Argalia Creek and a tributary of the Missouri River named Argalia River, both in what is today Montana.