The US didnt want war
They didnt want to start a war
NO! The Persian war was ancient Greece vs the Persians USA didnt even exist then.
yes
The US Navy relied heavily on it's air units to win the war.
They helped the Allies win the war.
The US contributed some 16 million personnel to the Second World War. I'd say that would indicate they did get involved.
China
It Gained Alaska
They didnt - the US used it on them twice
Fear of communism
yes the US didnt want another war to fight. they didnt join WWI till 1917 with the sinking of a us passenger ship carring weapons to britain.