The major condition that was responsible for the rapid growth of railroad industry was that the government started granting massive land easements to the railroads for free.
This was the most important part of the equation. Without the land grants all the other technological points were mere points of interest. Railroad owners sold stock to investors to finance the construction of railroads.
Nationalism is the correct answer I believe
The sun keeps the mud and sand dry, plus it doesn't rain in Egypt.
The answer is B since the natives immune system was weak to the diseases.
I believe it's quadratic, as quadratic matches the second time while linear matches the first time you find the differences.
