Why did the Missouri Crisis trigger threats of disunion and war? Why did the balance of free and slave states matter? What are the economic and political issues raised by having an imbalance between free and slave states?

Why did the Missouri Crisis trigger threats of disunion and war? Why did the balance of free and slave states matter? What are the economic and political issues raised by having an imbalance between free and slave states?The essays must be in MLA format. The essay should be 500 words in length, typed, 12-point Times New-Roman font, and double-spaced.