suitable housing for workmen, and had an important lesson in the
relation between wholesome home-life and industrial efficiency
(see Chapter X, pp. 112-113). Foundations were laid for the
adjustment of the unfortunate differences that have long existed
between workmen and their employers. The war suggested changes in
our educational methods, some of which will doubtless become
effective, to the great improvement of our public schools,
colleges, and technical schools.

We shall study some of these things more fully in later chapters.
They are mentioned now to illustrate how OUR NATIONAL PROGRESS WAS
STIMULATED WHEN THE WAR FORCED US TO SEE THE RELATION OF ALL THESE
THINGS TO ONE ANOTHER AND TO THE ACCOMPLISHMENT OF OUR NATIONAL
PURPOSE. On the other hand, failure to recognize this national
interdependence means slow progress as a national community. When
the war began, our nation was said to be "unprepared." Insofar as
this was true--and it was true in many particulars--it was because
in the times of peace before the war we had not thought enough
about the dependence of our national strength and safety upon all
these factors in our national life WORKING TOGETHER. And so, in
the times of peace AFTER THE WAR, if the purposes for which our
nation fought are to be fulfilled, we must continue to profit by
this lesson which the war has taught us.

Recall your discussion of national interdependence in connection
with your study of Chapter II.

Report on some of the important scientific and commercial
developments resulting from the war; as, for example: