It depends on which war your talking about, if WW1 then America thought there was no point in fighting in the war because it was stupid and it started for silly reasons then the Americans joined in and helped the British
what was the policy that kept the us out of the war for three years
Neutrality
The Neutrality Laws. Informally a policy of isolationism kept us out of the war until the USA was attacked.
isolationism and neutrality
neutrality
The US remained neutral. It declared war in 1917, three years into the war.
U.S. was involved in the Korean war for three years.
The US joined World War 1 only in 1917 - three years after the war broke out.
He kept us out of war
He kept us out of war. It was his slogan when he was running for re-election in 1914
Joseph Brown
Woodrow Wilson