Columbia subject headings:
Chile--Foreign economic relations--United States.
Free trade--Chile.
Free trade--Singapore.
Singapore--Foreign economic relations--United States.
United States--Foreign economic relations--Chile.
United States--Foreign economic relations--Singapore.
Harvard subject headings:
Chile--Foreign economic relations--United States.
Free trade--Chile
Free trade--Singapore.
Singapore--Foreign economic relations--United States.
United States--Foreign economic relations--Chile.
United States--Foreign economic relations--Singapore.
Princeton subject headings:
Chile--Foreign economic relations--United States.
Free trade--Chile.
Free trade--Singapore.
Singapore--Foreign economic relations--United States.
United States--Foreign economic relations--Chile.
United States--Foreign economic relations--Singapore.