The correct answer to this open question is the following.
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The two problems that led to the emergence of sociology are the French Revolution and the Industrial Revolution.
In the case of the French Revolution, you can explain it in that in that time all the French people that participated in the revolution created too much turmoil and they behave in a very distinct way when fighting for freedom from the monarchy and better living conditions. The way that people who belonged to the French's third state behaved was very particular and peculiar, to the degree of being the subject of interests of later scholars as was the case of Aguste Comte, considered to be the "Father of Sociology."
This turmoil and the further changes created by the French Revolution became objects of study for scholars trying to understand the concept of social order.
In the case of the Industrial Revolution, it radically changed the lives of the people and caused too much migration from the rural areas to the large cities where the big factories were located. It also made many people from Europe migrate to the United Kingdome, and later to the United States, trying to get a better living condition,
This also represented a source of big interest for scholars to study the social order and the conduct of people that had to face adversity and prosper under very difficult circumstances
Let's remember that Sociology studies society and its members in a scientific way.