Based on the information that is given within the question, It can be said that resilient children are able to cope with the challenges of poverty without any major setbacks. This is because they have the ability to withstand or recover quickly from difficult conditions without much problems compared to most other children.
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The word or phrase to fill into the gap is the "Ku Klux Klan", an extreme right organization calling for what they would call a "purification" of the US-American society.