I believe it was trade and industrialization.
We thought we were @ peace?
Answer:
Leapfrogging, also known as island hopping, was a military strategy employed by the Allies in the Pacific War against the Empire of Japan during World War II. The key idea is to bypass heavily fortified enemy islands instead of trying to capture every island in sequence en route to a final target.
Explanation:
ANSWER IS A. Old Spanish trail
Hope this helps
