Which circumstance was most directly responsible for the rapid growth of the railroad industry?

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.

montesquieu took the view that the roman republic had powers separated so that no one could usurp complete power. in the british constitutional system, montesquieu discerned a separation of powers among the monarch, parliament, and the courts of law.

its many islands, high mountains, and remote peninsulas isolated population centers.