ver the Oregon region, President Polk had secured during 1846, for
undisturbed settlement, three hundred thousand square miles of forest,
fertile land, and fisheries, including the whole fair Columbia Valley.
Our active "policy of the Pacific" dated from that hour. With swift and
clinching succession came the melodramatic Mexican War, and February,
1848, saw another vast territory south of Oregon and west of the Rocky
Mountains added by treaty to the United States. Thus in about eighteen
months there had been pieced into the national domain for quick
development and exploitation a region as large as the entire Union
of Thirteen States at the close of the War of Independence. Moreover,
within its boundaries was embraced all the great American gold-field,
just on the eve of discovery, for Marshall had detected the shining
particles in the mill-race at the foot of the Sierra Nevada nine days
before Mexico signed away her rights in California and in all the vague,
remote hinterland facing Cathayward.

Equally momentous were the times in Europe, where the attempt to secure
opportunities of expansion as well as larger liberty for the individual
took quite different form. The old absolutist system of government was
fast breaking up, and ancient thrones were tottering. The red lava of
deep revolutionary fires oozed up through many glowing cracks in the
political crust, and all the social strata were shaken. That the wild
outbursts of insurrection midway in the fifth decade failed and died
away was not surprising, for the superincumbent deposits of tradition
and convention were thick. But the retrospect indicates that many
reforms and political changes were accomplished, although the process
involved the exile of not a few ardent spirits to America, to become
leading statesmen, inventors, journalists, and financiers. In 1847, too,
Russia began her tremendous march eastward into Central Asia, just
as France was solidifying her first gains on the littoral of northern
Africa. In England the fierce fervor of the Chartist movement, with its
violent rhetoric as to the rights of man, was sobering down and passing
pervasively into numerous practical schemes for social and political
amelioration, constituting in their entirety a most profound change
throughout every part of the national life.

Into such times Thomas Alva Edison was born, and his relations to
them and to the events of the past sixty years are the subject of
this narrativ