What is the term for the classical conditioning technique that involves gradual, hierarchical exposure to a feared situation or object in a real or imagined way

Systematic desensitization.

Explanation:

Systematic desensitization refers to a  psychological treatment that includes relaxation techniques, anxiety hierarchy development and gradual exposure to the feared item or situation. Such treatment seeks to suppress a phobia's fear response, and gradually replace a calming response to the conditioned stimulation with counter conditioning. The relaxation training may include gradual relaxation of the muscle, calming sights, and sounds, and/or guided imaging.

the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.