THE MIGRATION OF POPULATIONS 89
an essential to the active relief of difficulties arising
through over-dense aggregations of the world’s peoples.
In this connection it is also to be noted that it has
already appeared that persons in one territory, anticipating
 trouble for itself from population-growth,
have advocated that another territory not under its
political control directly or indirectly should freely
open its borders to immigrants, because, according to
the (uninformed) judgments of these persons, the other
territory is capable of increasing its population-density.
Since, however, the recipient country carries all the
economic and political consequences of its immigration
policy, such advocacy is unwarrantable, and dictation
in the matter would but intensify the difficulties already
in existence. Readiness to consign troubles to others
is not an unknown feature even in national human
conduct.