Whose study of classical conditioning provided quite a bit of the foundation for what later became the behavioral perspective in psychology?

Asappp which of the following is not a requirement for an adult to become a u.s. citizen? have been born on u.s. soil pass a u.s. history and government test be a legal, permanent u.s. resident swear loyalty to the united states

Historical vs today's presidents (compare)

Why did lincoln inform the confederacy that he would not e sending troops or weapons as food supplies were sent to fort sumter?