1809:
November 9, Welsh-Canadian explorer David Thompson establishes Saleesh House as a fur-trading post of the North West Company in what is now Montana.
1841:
September 24, At the request of Catholic Salish Indians, Jesuit priests led by Father Pierre-Jean DeSmet establish St. Mary's Mission in the Bitterroot Valley, the first permanent settlement built by Europeans in what is now Montana.
1847:
May, Fort Lewis, an American Fur Company trading post built the previous year, is moved 15 miles downstream of its original location to a site that will later be renamed Fort Benton. Near the furthest navigable point on the Missouri River, it is the last stop for steamboats traveling upstream from St. Louis, by which it soon becomes an important river port for mountain men and pioneers, as well as the oldest continuously inhabited European-American settlement in what is now Montana.
1859:
October 4, The first steamboat, The Chippewa, from St. Louis arrived in Fort Benton, Montana, establishing it as the farthest-inland port in the world; accessible by steamboat on the Missouri River.
1862:
July 28, A short way to the west of Dillon on Grasshopper Creek, Montana's first gold discovery of note is made, giving birth to Bannack.
1863:
-::- Spring, The construction of the first transcontinental railroad in the United States officially began in 1863. The Central Pacific Railroad started building westward from Sacramento, California, while the Union Pacific Railroad began building eastward from Council Bluffs, Iowa and Omaha, Nebraska.
-::- May, Montana's most prominent gold find happened in Alder Gulch, about 30 miles as the eagle flies to the east of this now seat of Beaverhead County. Virginia City quickly grew to a gold camp of 10,000 people.
-::- August 25, John Bozeman leads a group of about 2,000 settlers along the Bozeman Trail, a new cutoff route connecting the Oregon Trail with the gold fields of southwestern Montana, which he and John Jacobs had blazed the previous year.
1864:
-::- January 10, Henry Plummer, the elected sheriff of Bannack, Montana, is arrested and summarily hanged by a vigilance committee on charges of leading a gang of road agents preying on traders from Virginia City
-::- May 26, 1864, Congress organizes the Montana Territory and admits Nevada into the union, completing the political organization of the West under local governments loyal to the Union;
-::- July 2, the Northern Pacific Railroad Company was chartered with plans for a main line from the Great Lakes to the Pacific Coast.
1866:
December 21, A Lakota war party led by Chief Red Cloud attacks a wagon train bringing supplies to newly-constructed Fort Phil Kearny on the Powder River in northern Wyoming. The Lakota see the fort, situated to protect travel to Montana mining country along the Bozeman Trail, as a threat to their territory. When a patrol led by Captain William J. Fetterman rides out to drive off the war party, it is lured far from the fort and destroyed to the last man. Fetterman and 80 soldiers of the U.S. 2nd Cavalry and 18th Infantry regiments, and civilians were killed by Lakota, Cheyenne, and Arapaho warriors in a lopsided battle that is soon mythologized as the Fetterman Massacre. A fort built the next year, Fort Fetterman, is named in his honor.
1867:
-::- August 2, In the Wagon Box Fight, three miles from Fort C.F. Smith, Montana, near Fort Phil Kearny, pitting a determined stand of a small party of 31 U.S. Army soldiers and civilians, well-armed and encircled by a wall of wagon boxes, manages to hold off 700 Sioux and Cheyenne warriors led by Red Cloud and Crazy Horse; the combined soldier/civilian force withstood six hours of attacks before relief finally arrived to disperse the warriors.
-::- April 29, Chief Red Cloud, representing several bands of Lakota, Dakota, and Arapaho Indians, and General William Tecumseh Sherman for the United States, sign the Fort Laramie Treaty of 1868, which brings an end to Red Cloud's War along the Bozeman Trail. Under terms of the treaty, the United States agrees to abandon its forts and military outposts along the Bozeman Trail, the indefinite closure of the Powder River Country and western South Dakota to white settlement, and grant enormous parts of the Wyoming, Montana and Dakota Territories, including the Black Hills area, to the Lakota people as their exclusive territory.
1868
November 27, Under the Second Treaty of Fort Laramie, the Crow Indians, also known as the Apsáalooke, were moved to a Montana reservation.
1869
May 10, The Transcontinental Railroad with the Union Pacific Railroad, westward from Omaha Nebraska, and Central Pacific Railroad, eastward from Sacramento, California, met and were joined at Promontory Summit, Utah, marking the completion of the transcontinental railroad.
1870
-::- January 23, More than 200 men, women, and children belonging to a friendly band of Piegan Blackfeet Indians are mistakenly attacked and massacred by a U.S. Army command on the Marias River in the Montana Territory.
-::- Spring, with the Northern Pacific Railroad Company chartered on July 2nd, 1864 with plans for a main line from the Great Lakes to the Pacific Coast. Now, construction has begun eastward from Minneapolis heading for the Washington Territory.
1871
Spring, The town of Twin Forks, established soon after the snows began to melt. It lies nestled in the rolling plains of Montana, amidst grazing lands rich with cattle, sprawling ranches, and open skies. Its history is as wild and unpredictable as the land it sits upon, with a blend of prosperity, hardship, and conflict that has shaped the people who call it home.
1875
October, the NPRR formed a southern rail junction in Hayfield, about 40 miles south of Twin Forks, connecting the Union Pacific RR, making it easier to ship cattle to southeastern markets and bring more settlers into the region..
1876
-::- March 17, When Sioux leaders Sitting Bull and Crazy Horse refuse to comply with the United States government's order to leave the Black Hills of the Dakota Territory, an expeditionary force commanded by General George Crook directs Colonel Joseph J. Reynolds to attack a Cheyenne encampment at the Battle of Powder River, thereby beginning the Great Sioux War. The Battle of the Powder River occurred in southeastern Montana. This battle between Colonel Joseph J. Reynolds’ troops and the combined forces of the Cheyenne and Oglala Sioux is a loss for the U.S. Army and contributed to the defeats of General Crook at the Rosebud and Custer at Little Bighorn because it caused the Indians to form a massive nation for self-preservation.
-::- June 17, Crazy Horse and 500 warriors surprise General Crook's troops on the Rosebud River, forcing them to retreat. The Battle of the Rosebud occurred between the U.S. Army and the Lakota and Cheyenne Indians in Montana Territory. After six hours and many lead shots, the Indians called off the fight after the braves had fought Crook’s men to a standstill. The defeat convinces Crook to withdraw from his planned offensive and await reinforcements.
-::- June 26, While leading an attack into a Sioux village in the Montana Territory, the U.S. 7th Cavalry Regiment under Brig. Gen. George Armstrong Custer is ambushed and massacred by over 2,000 Lakota and Cheyenne warriors led by Sitting Bull and Crazy Horse at the Battle of the Little Bighorn.
1877:
-::- June 25, Fort Missoula is established in the Montana Territory.
-::- August 9-10 -- The Battle of the Big Hole is fought in the Montana Territory between the Nez Perce and U.S. soldiers under Col. John Gibbon.
-::- October 5, cornered at the Battle of Bear Paw, just 40 miles south of the Canadian border in the Montana Territory, Chief Joseph, leader of the Nez Percé, and his dwindling band of Nez Perce surrenders to General Oliver Howard and Nelson A. Miles, bringing to an end his four-month-long circuitous retreat from the Wallowa Valley in eastern Oregon toward Sitting Bull’s encampment in Canada... one of the most remarkable military feats of the Indian Wars. Eluding or defeating army troops at every turn, Joseph and a band of fewer than 200 warriors bring nearly 500 women and children over 1,500 miles of mountainous terrain to within forty miles of the border before they are finally stopped by a force of 500 troopers led by Colonel Nelson A. Miles. Reduced by this time to just 87 men, Joseph still holds out for five days in a pitiless snowstorm, and then surrenders only because his people have no food or blankets and will soon die of cold and starvation. "I am tired of fighting," he declares as he holds out his rifle to General Howard. "I want to have time to look for my children, and see how many of them I can find. Maybe I shall find them among the dead. Hear me, my chiefs! I am tired. My heart is sick and sad. From where the sun now stands I will fight no more forever.";
1878
summer, Twin Forks had grown from a collection of scattered homesteads to a bustling frontier town. And since 1869, the completion of the Transcontinental Railroad spurred off-shoots. Not long after the Union Pacific pushed west out of Omaha, the Northern Pacific Railroad pushed west from Minneapolis. By mid-1878, the NPRR formed a southern rail junction in nearby Hayfield, about 40 miles south of Twin Forks, making it easier to ship cattle to southeastern markets and bring more settlers into the region.
1883 :
-::- September 8, The Northern Pacific Railroad is completed near Independence Creek in western Montana Territory, connecting St. Paul, Minnesota with the Washington Territory. The NPRR was chartered on July 2nd, 1864 with plans for a main line from the Great Lakes to the Pacific Coast, with construction eastward from Minneapolis began in 1870. The main line from the Great Lakes to the Pacific Coast was completed with the driving of the final "golden spike" in Montana Territory by Ulysses S. Grant.
1899 :
November 8, Montana is admitted as the 41st U.S. state.
1983:
May 15, Provoked by the previous year's strike in Coeur d'Alene, coal miners establish the Western Federation of Miners in Butte, Montana.