Hello. You have not specified which Josephine Baker speech this question refers to, which may leave the evidence a little inaccurate.
Answer:
Baker presents the main idea of the text through her own experience with the racism that she found in the USA.
Step-by-step explanation:
Baker presents how racism was harmful in her life, causing her to suffer segregation and preventing her from being a citizen who contributes fully to the growth and development of herself and the country as a whole. To confirm the damage of racism as a central idea of his speech, Baker shows her experience in the USA and how racism in that country did not allow her to grow, but when she fled to other countries that did not limit her, she became a great artist that contributed a lot to the culture and development of the country that hosted it.