Final answer:
The economic depression after 1893 contributed to a spike in lynching, prompting Ida B. Wells' anti-lynching campaign and the eventual formation of the NAACP to fight against racial violence and injustice.
Step-by-step explanation:
The event that contributed to a spike in lynching after 1893 was the nation going through an economic depression. During this period, exacerbated racial tensions and economic strife contributed to increased acts of racial violence, like lynching, against African Americans. Ida B. Wells began her anti-lynching campaign after the lynching of her friends and as a response to the widespread racial violence of the time. She tirelessly worked to document the lynching of African Americans and bring national attention to the issue. Additionally, the formation of the NAACP was in part a response to the rampant lynching and race riots, as the organization played a crucial role in civil rights advocacy and the anti-lynching movement.