Commonly referred to as the "Pennsy," the PRR was headquartered in Philadelphia<span>, Pennsylvania. The PRR was the largest railroad by traffic and revenue in the U.S. for the first half of the twentieth century.</span>
presidential candidate's tax records
By bombing Pearl Harbor unexpectedly.
Answer:
The intervention by some civilized nation can be caused by war and famine. Loss of property and other things can be caused through this and can cause intervention by some civilized nation.
Explanation:
Actually the real answer is the second and first world war pouring money into the us economy for output. If that is not an option it would be the invention of the steam engine and the 1800's locomotive industry.
