Final answer:
The manager eventually conceded to no segregation in the national theatre due to the erosion of racial barriers, demands for equal treatment, and legal pressure.
Step-by-step explanation:
The manager eventually conceded to no segregation in the national theatre due to various factors. One reason was the erosion of racial barriers and the demand for equal treatment by black players and individuals. Additionally, owners and managers recognized the negative consequences of racial conflict and the importance of attracting a diverse audience. They wanted to avoid alienating white spectators and damaging their financial interests. Furthermore, civil rights laws in some states outlawed racial discrimination in public places, putting pressure on proprietors to change their policies.