Early results in Argentina’s legislative elections on Sunday showed a landslide victory for President Javier Milei as voters overwhelmingly backed his free-market reforms and deep austerity measures, providing a strong boost for the libertarian leader to continue his economic overhaul. The president’s party, La Libertad Avanza, scored 41.5% of the vote in Buenos Aires province compared with 40.8% for the Peronist coalition, according to official results. The province has long been a political stronghold for the Peronists, marking a dramatic political shift. Nationwide, La Libertad Avanza got 64 seats in the House of Deputies, up from 37, according to government...