To take but one instance. How confident were the assertions
made in the days preceding the unification of the states of the North
American continent regarding the insuperable barriers that stood
in the way of their ultimate federation! Was it not widely and
emphatically declared that the conflicting interests, the mutual distrust,
the differences of government and habit that divided the states
were such as no force, whether spiritual or temporal, could ever hope
to harmonize or control? And yet how different were the conditions
prevailing a hundred and fifty years ago from those that characterize
present-day society! It would indeed be no exaggeration to say
that the absence of those facilities which modern scientific progress
has placed at the service of humanity in our time made of the problem
of welding the American states into a single federation, similar
though they were in certain traditions, a task infinitely more complex
than that which confronts a divided humanity in its efforts to
achieve the unification of all mankind.