Political instability: Lincoln's assassination left a power vacuum in the government with the sudden loss of a strong and experienced leader. This raised concerns about the ability of the remaining leaders to effectively govern and maintain stability in the country.

2. Uncertainty about leadership: With Lincoln gone, there was uncertainty about who would succeed him and what direction the country would take. This uncertainty about leadership could potentially disrupt the progress made during Lincoln's presidency and lead to further political turmoil.

3. Threats to national unity: Lincoln's assassination symbolized the deep divisions and tensions present in the country, particularly between the North and South. The loss of Lincoln, a unifying figure during the Civil War, raised concerns about the potential for further division and conflict between different regions and factions within the nation.

4. Economic and social impacts: The assassination of Lincoln also raised concerns about the economic and social stability of the nation. The loss of a leader who had guided the country through a tumultuous period could have significant implications for the nation's future economic and social development, leading to further uncertainty and instability.

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Lincoln's assassination created a power vacuum and uncertainty about leadership, threatening national unity and stability. It also raised concerns about economic and social impacts on the nation.