In three sentences, explain why Lincoln’s assassination put the future of the nation in question.

Lincoln's assassination left a power vacuum at a critical juncture in American history, as the country was still recovering from the Civil War and grappling with issues of reconstruction. With Lincoln's leadership suddenly cut short, there was uncertainty over who would take his place and whether they would be able to unite the country and navigate the difficult path forward. The assassination also sparked fears of further violence and instability, raising concerns about the long-term stability and unity of the nation.