For me, the caption does the work that is necessary here. Of course, more detailed historical context would be helpful for a non-USA audience however then the caption would likely become less punchy. Combined with the image the caption enough information is provided to generate questions and reflection about toxicity, populations, place-making, representation, etc.
Both the caption and the image address the divisive production of space. But the image actually goes further than the caption : by defining a given population (one with white children) as desired for bettering the neighborhood, it negatively frames the current population as blight-causing ; through presenting whiteness as a remedy, the image is actually about the toxicity of blackness. The caption, on the other hand, could be more explicit, and mention outwarldly the category that is enforced through the divisive production of space : blackness.