How do changes in the polar jet stream affect global weather?

Shifting jet stream patterns can have a big impact on the weather. ... Air north of a jet stream is typically colder, while air to the south is usually warmer. As jet streams dip or break off, they move air masses around, creating shifts in global weather patterns

Explanation:

the only other powers were germany russia and uk and they were too busy fighting each other wearing each other down   that the us was becoming strong and they were becoming weaker

answer at the divergent plate boundary in the middle of the ocean;