Columbia subject headings:
Comparative civilization.
Latin America--Civilization.
Social evolution.
United States--Civilization.
Harvard subject headings:
Comparative civilization
Imperialism
Latin America--Civilization.
Social evolution.
Spain--Colonies--North America.
United States--Civilization.
United States--Territorial expansion.
Princeton subject headings:
Comparative civilization.
Latin America--Civilization.
Social evolution.
United States--Civilization.