When global commodities prices began to decline, they took Argentina's economy with them, exacerbating the country's long-standing economic problems, such as high inflation, isolation from foreign capital markets and heavy government spending. Mauricio Macri won the presidency in November 2015 on a campaign to improve the country's economic straits, and his administration has made some progress in this endeavor over the past year. But at every turn, Macri has had to contend with the constraints he inherited from his predecessor, which have limited his success and may eventually spell his political defeat. Now, a bitter battle is looming over another relic of the past administration as Macri prepares to take on high gasoline prices -- and the provinces they benefit....