Answer:
Everything from the medieval ages to today.
- Circle - Cart - Rails - Train - Car - Airplane
Explanation:
I wonder what will be next.
Germany- The U.S. might be less willing to support Germany in a time of war after WW1, but would help them immensly during a time of peace.
Japan- The U.S. might be less willing to support Japan during a time of war, but would help Japan during a time of peace.
Mexico- The U.S. might not help Mexico during a time of war (because of Trump), but would probaly help Mexico during peace.
Hope This Helps!