From the graph that we have here, the event that is responsible for this change is A product becomes less popular and fewer customers purchase it.
The reason this is the answer is because when e look at the graph closely, we can see that only demand fell from 50 to 40. There was no change in price, it remained at 15 dollars.
A fall in demand even at the same price that a good was sold previously shows us that less people are buying the product. This could be due to changing consumer preference.
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Some of theses changes should occur when there is no war going on
Answer: open new markets.
Explanation:
The greatest priority of western railroad development as illustrated above was to open new markets.
Connecting the coasts made exportation easier to the Eastern markets. The development of the railroad also brought about new economic opportunities and new territories were also easily accessible.
The answer is c, religious tolerance. I hoped I helped.