geography--Land basis of society--Morgan's _societas_--Land bond in
primitive hunter tribes--In fisher tribes--In pastoral tribes--Land and
state--Strength of the land bond in the state--Evolution of land
tenure--Land and food supply--Advance from natural to artificial basis
of subsistence--Land basis in relation to agriculture--Migratory and
sedentary agriculture--Geographic checks to progress in economic and
social development--Native animal and plant life as factors in
progress--Density of population under different cultural and geographic
conditions--Its relation to government--Territorial expansion of the
state--Artificial checks to population--Extra-territorial relations of
state and people--Theory of progress from the standpoint of
geography--Progressive dependence of man upon nature.


CHAPTER IV. MOVEMENTS OF PEOPLES IN THEIR GEOGRAPHICAL SIGNIFICANCE

Universality of such movements--The name Historical Movement--Its
evolution--Its importance in history--Geographical interpretation of
historical movement--Mobility of primitive peoples--Civilization and
mobility--Migration and ethnic mingling--Cultural modification during
migration--The transit land--War as form of historical
movement--Slavery--Military colonies--Withdrawal and flight--Natural
regions of asylum--Emigration and colonization--Commerce as a form of
historical movement--Movements due to religion--Historical movement and
race distribution--Zonal distribution--Movements to like or better
geographic conditions--Their direction--Return movements--Regions of
attraction and repulsion--Psychical influences in certain movements--Two
results of historical movement--Differentiation and
area--Differentiation and isolation--Geographic conditions of
heterogeneity and homogeneity--Assimilation--Elimination of unfit