Final answer:
President Johnson's speech conveyed the extensive and bipartisan support for the Civil Rights Act of 1964, showcasing it as a foundational step towards equality in America.
Step-by-step explanation:
President Lyndon Johnson's message in his speech upon signing the Civil Rights Act of 1964 emphasized the act's wide-reaching support across political parties and among various leaders and citizens in the United States. By highlighting the bipartisan support and the backing from civic and religious leaders, Johnson aimed at underscoring the national consensus and the importance of the legislation in promoting equality. The act, a pivotal moment in the civil rights movement, prohibited discrimination based on race, religion, gender, or national origin in various areas including public accommodations, employment, and federally funded programs.