Columbia subject headings:
Canada--Civilization--1945---Congresses.
Outer space--Social aspects--America--Congresses.
Popular culture--America--Congresses.
United States--Civilization--1945---Congresses.
Harvard subject headings:
Canada--Civilization--1945---Congresses.
Group identity--United States--Congresses.
Popular culture--America--Congresses.
Space--Social aspects--America--Congresses.
Space--Social aspects--United States--Congresses.
United States--Civilization--1945---Congresses.
United States--Civilization--21st century--Congresses.
Princeton subject headings:
Canada--Civilization--1945-
Imaginary places in mass media.
Popular culture--America.
United States--Civilization--1945-