What new technology was used by the Germans in the Atlantic that hurt trade and damaged ships by the Allies?

Sonar
Torpedos
U Boats
poison gas

What was the difference between bombing military targets in the united kingdom, and bombing the city of london? a. bombing a city kills lots of innocent civilians, bombing a military target doesn't b. bombing military targets didn't force the u.k. to surrender, but bombing london did c. military targets were bombed by japan, while london was bombed by the nazis d. london was bombed before the u.s. entered the war; military targets were bombed afterward

Could anything have been done through compromise to stop it, or did it have to happen?

What is george calvert's american colony