Final answer:
In the late 1960s, Martin Luther King's strategy shifted to focus on economic inequality, expanded his work beyond the South, and became critical of the Vietnam War.
Step-by-step explanation:
Martin Luther King's strategy shifted in several ways in the late 1960s. Firstly, he began to emphasize economic inequality along with racial injustice, advocating for economic opportunities and fair wages for African Americans. Secondly, he shifted his focus from the South to the North, recognizing that racial discrimination was not limited to the southern states. Lastly, he became more critical of the Vietnam War, seeing it as a distraction from the fight for civil rights and an obstacle to funding anti-poverty programs.