When Juan was a child he was attacked by a swarm of hornets in his back yard. Now every time he hears the sound of hornets he immediately becomes frightened. This is an example of:

a phobia or tramua maybe??

When Juan picks up on a certain sense that relates to the hornets, his mind goes back to the accident. He cannot get over his trauma.

I hope this gives you some sort of a lead :))

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.