The Collaborative International Dictionary of English v.0.48:
Pan-American Congress \Pan-American Congress\
Any of several meetings of delegates from various American
(a) One held in 1889-90 in the United States, at which all
the independent states except Santo Domingo were
represented and of which the practical result was the
establishment of the Bureau of American Republics for the
promotion of trade relations.
(b) One held in Mexico in 1901-1902.
(c) One held at Rio de Janeiro in 1906.
[Webster 1913 Suppl.]