Why are the spiro mounds location important to Oklahoma today?

The mounds are one of the most important American Indian sites in the nation. The prehistoric Spiro people created a sophisticated culture which influenced the entire Southeast. Artifacts indicate an extensive trade network, a highly-developed religious center, and a political system which controlled the entire region.

Explanation:The Spiro Mounds are a part of a time period in archaeology known as the Mississippian. The Spiro Mounds are important because they are located along the Arkansas River and the people of Spiro influenced many of the people with which they traded.

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:

d) post-world war i