Sentence:  ... [Debra] Van Ausdale transcribes an exchange among two white girls (both aged four) and one Asian girl (age three) who are playing with a <WSD>wagon</WSD>. One of the white girls is pulling the other children. When the <WSD>wagon</WSD> gets stuck the Asian girl jumps out to help pull. The white girl responds, "No, no. You can't pull this <WSD>wagon</WSD>. Only white Americans can pull this <WSD>wagon</WSD>." ... Here, a four-year-old is using a construction that joins race and perceptions of citizenship to exclude in her play. 
Meaning of the word marked with <WSD> tags:  A four-wheeled child's riding toy, pulled or steered by a long handle attached to the front.