Final answer:
The author noted the signing of the Civil Rights Act in the same room as the Emancipation Proclamation to highlight the historical significance and continuity of civil rights efforts.
Step-by-step explanation:
The author noted that President Johnson signed the Civil Rights Act into law in the same room that President Lincoln signed the Emancipation Proclamation in order to highlight the historical significance of the event. By drawing a connection between the two presidents and emphasizing the importance of the Civil Rights Act, the author intended to illustrate the continuity of civil rights efforts.