Many Uruguayan-born people live in Chile, for a number of reasons.
Both countries share the Spanish language; the historical origins of both nations is common (part of the Spanish Empire until the early 19th century); Chile has a bigger, more diverse economy, which attracted Uruguayans in search of opportunities; the relative geographical vicinity (Southern Cone) also helps.
Modern estimates put the figure of Uruguayans in Chile at over 9,000.
[2] Uruguayan residents in Chile have their own institutions, for instance, the Consultative Council in Santiago.
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