By acceding to Venezuela 's petition to join -- a political decision spearheaded by the left-leaning presidents of Brazil and Argentina that the smaller Uruguay has accepted and Paraguay is expected to back -- Mercosur members say they are inviting a nation that is South America 's biggest oil producer and third-biggest economy to join in fueling a sluggish , long-pursued effort to integrate the region 's economies .
South America /location/location/contains Argentina
South America /location/location/contains Uruguay
South America /location/location/contains Paraguay
South America /location/location/contains Venezuela
South America /location/location/contains Brazil
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South America
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Brazil
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