Answer:
When Lyndon Johnson signed the Civil Rights Act of 1964, he was playing the role of Chief Legislator.
Step-by-step explanation:
As President, Lyndon Johnson was responsible for proposing and advocating for legislation to Congress. The Civil Rights Act of 1964 was a major piece of legislation aimed at ending racial segregation and discrimination in the United States, and Johnson played a key role in getting it passed into law. As Chief Legislator, he worked with Congress to develop and pass the bill, and then signed it into law once it was approved by both the House of Representatives and the Senate.