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Buenos Aires; federal presidential constitutional republic; Cristina Fernandez de Kirchner, president.
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La Paz; unitary presidential constitutional republic; Evo Morales, president.
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Brasilia; federal presidential constitutional republic; Dilma Rousseff, president.
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Santiago; unitary presidential constitutional republic; Sebastian Piñera, president.
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Bogota; unitary presidential constitutional republic; Juan Manuel Santos, president.
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