Whitch statement is the most accurate about united states' involvement in world war i

The most accurate statement about USA in World War I is “The United States stayed out of the war for more than two and a half years.”

Explanation:

The president of USA Woodrow Wilson didn’t want to participate in the world war so he stayed out of the war for almost two and half years following their policy of neutrality. But after Germany started the submarine warfare, USA also formally involved in the war. Until the submarine attack in 1917, USA was out of the war for about two and half years of World War I.