The NAACP was trying to send Americans the message with the 1943 poster that there was no scientific basis to the separation that existed between black blood donors and white donors.
After the second world war, while people were donating their bloods to help victims, black people were being turned away and stopped from helping out.
This act led to a series of protests by the black people who felt that they were being excluded from helping and that there was no difference between the blood of a black man and that of a white person.
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