It's likely religious but it could als be D.
Answer:
The correct answer is the The Irish Famine
Explanation:
Also known as the Potato Famine of Ireland and the Great Famine. It started around 1845 and lasted till 1849.
The famine caused hunger and disease to go rampant and killed almost a million people. During the time, Ireland saw one of the great migrations take place as thousands left for the United States to seek a better life.
When the Famine was over, the demographics of the country had completely changed.
By the 1900, New York had more Irish than Dublin and today over 34 million Americans have Irish ancestry. Which is 5 times the population of Ireland itself
The South required all men 18-45 to enlist with few exceptions. The North offered a bounty of $300 which led to more volunteers. ... Inflation became a problem, especially in the South; Northern industry grew; the Union initiated an income tax and paper currency.
Great plains farming signified an agricultural revolution because industrialization took both the transportation and production of agricultural products to a much larger scale.
Railroads made cattle farming, among other agricultural products, much more profitable, as farmers/ranchers were able to ship their products around the country.
Industrialization also lead to devices that could increase the scale and speed of agriculture, and also caused corporations to become involved in large-scale production/
