Suppose a policymaker argues against expanding the United States' nation-building capacities by pointing out the obstacles to social engineering. That policymaker is most likely a .

"Realist" is the correct answer.

Explanation:

Realism seems to be a philosophy pretending to somehow describe contemporary political life.Everything always underlines the political limits arising from either the self centered character of humanity as well as the unavailability of a strong central government over the community as well as the country.

Thus the above is the right answer.