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Cass County, Missouri, has a rich and diverse history that stretches back to the early 19th century. The area was originally inhabited by Native American tribes, including the Osage, before European settlers arrived in the early 1800s. In 1825, Cass County was officially established and named after Lewis Cass, a prominent politician of the time.

The county's early history was marked by the westward expansion and the trails that passed through the area, including the Santa Fe and Oregon trails. These trails brought a steady stream of settlers and pioneers to Cass County, contributing to its growth and development. In the mid-1800s, the county experienced significant economic and agricultural growth, with the cultivation of crops such as tobacco and hemp, as well as the establishment of many small towns and communities.

During the Civil War, Cass County became a contentious battleground due to its proximity to Kansas, a territory that was deeply divided over the issue of slavery. The county saw both Union and Confederate sympathizers, leading to armed conflicts and raids by guerrilla groups like Quantrill's Raiders. The war had significant impacts on the county, with destruction and loss of life, as well as long-lasting divisions among its residents.

In the years following the Civil War, Cass County focused on rebuilding and diversifying its economy. The arrival of the railroad in the late 19th century brought new opportunities for trade and transportation, stimulating the growth of towns like Harrisonville and Pleasant Hill. Today, Cass County continues to thrive as a suburban and rural community, with a strong agricultural heritage and a growing population.