The only american that were not immigrants

None.

According to history, every single human being immigranted to the US.

For example, the Native Americans immigranted during the Ice Age.

White and African Americans immigranted from Europe and Africa respectively.

etc.

~Senpai

The correct answer is sensorimotor, preoperational

Sensorimotor system. This term is used to coordinate different motor control processes. Movements that can only be realized initially with the activation of the highest level (cortex), become increasingly automated.

Preoperative thinking is the stage of cognitive development that the child goes through between 2 and 7 years old. It was the psychologist Jean Piaget who developed the knowledge of the evolution of human thought from birth.