Bolivian election frontrunners Rodrigo Paz and Jorge Quiroga have both vowed to strengthen US ties. Photo: AP PHOTO

Polls in Bolivia have closed and voters awaited the results of a presidential runoff that marks a decisive rejection of the socialist government and a likely foreign policy shift toward the United States after decades of frosty relations.

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Initial results are expected after 12pm AEDT.

The race pits centrist Senator Rodrigo Paz against conservative former president Jorge "Tuto" Quiroga. Both candidates have pledged to strengthen diplomatic ties with Washington - straine

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