Columbia subject headings:
Europe--History--1848-1849.
Europe--Relations--United States.
Public opinion--United States.
United States--Relations--Europe.
Harvard subject headings:
Europe--History--1848-1849.
Europe--Relations--United States.
Public opinion--United States
United States--Relations--Europe.
Princeton subject headings:
Europe--History--1848-1849.
Europe--Relations (general) with the United States.
Public opinion--United States.
United States--Relations (general) with Europe.