The well-being of society is a factor but I'd need more information to answer the question properly
Answer:
Christopher Columbus
Explanation:
Sailed the ocean blue in 1492
Tu jefa ____________________________
<span>To keep the trains run on time, switching and communications systems were innovated. Tunnels, bridges, Traffic lights and several miles of electrified tracks were laid. Also diesel locomotives were introduced which enabled to transport more freight with less number of workers.</span>