Why did slave owners consider Missouri to be slave country?

Slave owners considered Missouri to be slave country due to its geographical location and its agricultural economy, which was conducive to plantation-style farming reliant on enslaved labor. The state's entry into the Union as a slave state in 1821, as part of the Missouri Compromise, further solidified this status. Additionally, the presence of established slaveholding communities and the demand for cotton and other cash crops contributed to the perception of Missouri as an integral part of the Southern slave economy.