CORRECT ANSWER GETS BRAINLIEST How did Germany stop American trade?
With threats
With submarine attacks
With negotiations
With airplane bombings

Submarine attacks

Explanation:

Germany was famous with its submarines. They would use zeppelins to bomb, and never negotiated or made threats on a major country because of WWII and WWI

The correct answer is submarine attacks hope this helps plz mark brainliest if correct :D

a factory opens that mass-produces light bulbs.

explanation:

not sure if that's an answer to your questions but this is an example! : )