some researcher have been commented about this subject and they have identified a variety of actors who appears to influence united state foreign policy.
they including expert and " epistemic communities" organized interests ( especially business and labor) and ordinary citizen or public opinion.
the results about searching by specialist are: u.s. foreign policy is most heavily and consistently influenced by internationally oriented business leaders, followed by experts.
in summary, according the last explanation, the examples are: strong currency and trading relationships.