The correct answer is B.
The development of cheap iron in the US was the major factor that lead to the building of skyscrapers. Being able to produce iron cheaply can be contributed to Andrew Carnegie. This American business mogul perfected the Bessemer process in several factories across the eastern part of the US. From there, he was able to sell cheap iron to American businesses for the purpose of growing their empire.
The answer to your second question is D.) Welfare
What subject are you learning
Answer:
The ban against enslaving Muslims was observed very strictly in Hausaland in many ways. For example. if a non-believer would become a Islamic so called "believer", he would no longer would be someone's possession (slave). This is somewhat illogical because anyone could say that they are a Muslim just to become a free man or woman.
Explanation:
I majored in History
