Final answer:
Lily likely doubts the immediate impact of the Civil Rights Act of 1964, implying Rosaleen's optimism may overlook the complex societal issues that wouldn't be resolved solely through legislation.
Step-by-step explanation:
If Lily refers to Rosaleen as "oblivious" after watching President Johnson sign the Civil Rights Act of 1964, it suggests that Lily may be skeptical about the efficacy of the legislation. She might believe that, despite the legally mandated changes, the deeply entrenched societal discrimination and racial prejudices wouldn't be eliminated overnight. This act, signed into law on July 2, 1964, was a monumental piece of legislation that aimed to outlaw discrimination based on race, religion, national origin, and gender in public accommodations, housing, and jobs, and also established the Equal Employment Opportunity Commission. President Johnson's dedication to civil rights and his political prowess played a crucial role in the passage of this Act, which sought to rectify the centuries of institutionalized discrimination, particularly against African Americans. However, Lily's use of the term "oblivious" implies a belief that Rosaleen may be naively optimistic, not fully grasping the societal resistance that could hamper the actual realization of civil rights despite the legal victory.