Eighteen-month-old Joshua received a train set from his visiting grandmother. Joshua's grandmother set it up and demonstrated how to drive the train on the track while saying "chugga, chugga, choo, choo." Later that day, Joshua picked up a train piece and imitated the "chugga, chugga, choo, choo" sounds. Joshua's behavior places him in the substage of the sensorimotor stage.

Which best explains why the supreme court’s decision in plessy v. ferguson was unconstitutional? the supreme court’s ruling allowed states to deny equal protection to any person within its jurisdiction. since the 14th amendment did not make concessions for people born outside the us, the supreme court’s decision could not be applied. the supreme court’s decision gave individual states the freedom to make their own laws in relation to non-whites. since segregation laws did not provide equal protections or liberties to non-whites, the ruling was not consistent with the 14th amendment.