Last March, when President Obama travelled to Argentina to meet with the country’s new President, Mauricio Macri, his public appearances were dogged by protesters who noisily demanded explanations, and apologies, for U.S. policies, past and present. There are few countries in the West where anti-Americanism is as vociferously expressed as in Argentina, where a highly politicized culture of grievance has evolved in which many of the country’s problems are blamed on the United States. On the left, especially, there is lingering resentment over the support extended by the U.S. government to Argentina’s right-wing military, which seized power in March of 1976 and launched a “Dirty War” against leftists that took thousands of lives over the following seven years.