They failed because nobody cared about the railroad. The railroad had to be a government project with leases to companies but the government was too much involved in the slavery issue that it didn't have time to deal with railroads. That's why railroads boomed after the civil war ended.
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Number (1) should be your answer. It's definitely not 2 or 4
Answer:
South east asia is full of : mountain ranges, plains and plateaus, and water in the form of both shallow seas causing the surronding regions to be divided.
Explanation:
