Please explain “Costs of a State Action Requirement”

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This requirement only applies when the law in question requires the government to have acted.  

This state action requirement extends to a number of actions.

According to the Supreme Court in Edmonson v. Leesville Concrete Co., Inc., 500 U.S. 614 (1991), "Although the conduct of private parties lies beyond the Constitution's scope in most instances, governmental authority may dominate an activity to such an extent that its participants must be deemed to act with the authority of the government and, as a result, be subject to constitutional constraints."

Explanation:

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.