After sentence 3 you could add, because the students would not need to spend so much time reviewing previously covered material, then they would have more time to master new concepts. This sentence is the one that works best because it makes reference to the topic dealt in the last sentence and also is connected to the next sentence in a logical and coherent way.
Answer:
D) The north
Explanation:
Big industries, railroads, and some inventions popped up in the north, while the south was still lacking.
i hope this helped, idk. feel free to ask for more info!
During the Great Depression, the international economy began to collapse in 1929 due to the stock market crash in the United States, which was caused largely by speculation. High international tariffs also played a role.