B. Assassination of Martin Luther King Jr.
The assassination of Martin Luther King Jr. on April 4, 1968, was a deeply tragic and divisive event that had a profound impact on the United States. It sparked widespread protests and civil unrest, and it also contributed to the deep divisions within the Democratic Party. Many people, particularly those in the civil rights movement, saw King's assassination as a symbol of the ongoing struggle for equality and justice, and they were frustrated with the slow pace of change. This event, along with other factors such as the Vietnam War and the rise of the counterculture movement, contributed to the divisions within the Democratic Party and the broader political landscape in the United States.