This is the fourth volume of Dwight Pitcaithley's ongoing series of edited primary documents related to secession debates on the eve of the Civil War. Like Kentucky, Missouri ultimately voted to remain in the Union after contentious debates. While voters overwhelming embraced the Union, Missouri Governor Claiborne Jackson did not—he established a government in exile and left the state government in control of the lieutenant governor. This fracturing reflected the intensely divided leadership of the state. Chapter 1 includes addresses by outgoing and incoming governors. Chapter 2 includes speeches by the state's US senators. Chapter 3 includes speeches by US house members. Chapter 4 covers the Missouri state convention. Chapter 5 has documents related to the replacement government.