In the defense of their national life they had expended in less than five years more than four thousand million dollars.

Their census, periodically taken, showed that the population was doubling itself every twenty-five years; it justified the expectation that at the close of that century it would number nearly one hundred million souls.
KNOWLEDGE IS POWER.

A silent continent had been changed into a scene of industry; it was full of the din of machinery and the restless moving of men.

Where there had been an unbroken forest, there were hundreds of cities and towns.

To commerce were furnished in profusion some of the most important staples, as cotton, tobacco, breadstuffs.