Columbia subject headings:
Harvard subject headings:
Europe--Foreign relations.
Europe--Military relations.
Europe--Politics and government--1989-
European federation
Kant, Immanuel, 1724-1804. Zum ewigen Frieden.
National security--Europe
Peace
Security, International
Princeton subject headings:
Europe--Foreign relations.
Europe--Military relations.
Kant, Immanuel, 1724-1804. Zum ewigen Frieden.
Security, International.