Lincoln's assassination called the nation's destiny into doubt since he led the Union during the Civil War and played a key role in settling the country. His death created a power vacuum in the administration, raising concerns about who would lead the nation and how the reconstruction effort would proceed. Also, Lincoln's death shocked the nation, causing widespread doubt and concern about the country's future.

Furthermore, the assassination of Lincoln led to increased tensions and divisions within the country. Many blamed certain groups or individuals for his death, leading to further unrest and turmoil. The loss of such a beloved and respected leader also had a profound impact on the morale of the nation.

In addition, Lincoln's assassination had significant political implications. It led to the rise of Vice President Andrew Johnson, who had vastly different views and policies than Lincoln. Johnson's presidency was marked by conflict with Congress and a contentious reconstruction process, leading to further uncertainty and instability in the nation.

Overall, Lincoln's assassination cast a shadow of doubt and uncertainty over the country's future, as it raised questions about leadership, unity, and the direction of the nation. The impact of his death was felt for many years to come, shaping the course of American history in profound ways.