<span>C) A nation’s wealth is measured in gold and silver.
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The correct answer is option D. "Companies replaced hand-operated brakes with air brakes on trains". The development of air brakes on trains was a significant improvement of railroad safety. Air brakes function much more faster than hand-operated brakes, because hand-operated brakes required that the brakemen turned the brakes in one car and jump to the next to set the brakes on, and so on.
Answer:
Early success in the Po Valley There, tensions over pay and work conditions had put landowning farmers in conflict with Socialistbacked workers. The Fascists, led by Mussolini formed a street-fighting group called the Backshifts to support the landowners.
Explanation: