The expedition under stephen h. long mistook the river for the red river and abandoned their mission in 1820.
a. arkansas
b. missouri
c. canadian
d. mississippi

The correct answer is A) Arkansas.

The expedition under Stephen H. Long mistook the Arkansas River for the Red River and abandoned its mission in 1820.

Throughout the history of the United States, many expeditions were organized in order to explore new lands and the recognition of others. Major Stephen H. Long led one of these expeditions in 1819-20. He was a Topographical Engineer. He led the people that embarked on the ship Western Engineer in the Port of Pittsburg, Pennsylvania. It was on July 24, 1820, that they crossed the Arkansas River down south, and on the 28th, he realized he mistook the Arkansas River for the Red River and abandoned its mission.

wwii

explanation:

answer: secession

secession, as it applies to the outbreak of the american civil war, comprises the series of events that began on december 20, 1860, and extended through june 8 of the next year when eleven states in the lower and upper south severed their ties with the union. the first seven seceding states of the lower south set up a provisional government at montgomery, alabama. after hostilities began at fort sumter in charleston harbor on april 12, 1861, the border states of virginia, arkansas, tennessee, and north carolina joined the new government, which then moved its capital to richmond, virginia. the union was thus divided approximately on geographic lines. twenty-one northern and border states retained the style and title of the united states, while the eleven slave states adopted the nomenclature of the confederate states of america.

explanation: