Question

Why did the neutrality laws fail to prevent america's growing involvement with the military conflicts in europe and asia?

Answer 1

USA trade intrests in the Mediterranean and  the Atlantic were severely affected, and any effort to secure those intrests meant war.  In addition, after the war, the world became polarised and the Soviets who were communists were aggressively expanding around the globe, which implied that American system of free trade and democracy was being threatened.