The answer would be B if i am not mistaken.
Answer:
Mexico
Explanation:
Because the railroads were built along the continent of North and South America, Mexico was able to be accessible to trade for most trade areas in the continents
Due to trench warfare the machine gun caused stalemates because it was difficult to move up
Canals, railroads, roads, and rivers
That is true. By making travel on rivers more efficient.
