I navigated the nation through a period of significant social change, and my administration saw the passage of landmark civil rights legislation. My foreign policy involved a complex conflict in Southeast Asia, and I also launched ambitious programs aimed at addressing poverty and inequality at home. Who am I?

1. I served as a US Senator before becoming President.
2. My domestic programs were known as the 'Great Society'.
3. The Tonkin Gulf Resolution played a significant role during my presidency.
4. My vice president later became president.