Los Angeles (AFP) – US President Joe Biden heads Wednesday to a Latin America summit on a mission to woo back the region as his administration pushed out pledges, including a plan to train half a million health workers. The long-awaited Summit of the Americas was marred by a boycott from Mexico’s president, who was upset that Biden did not invite the leftist leaders of Cuba, Nicaragua and Venezuela on the grounds that they did not meet democratic standards. The Biden administration insisted there were no hard feelings and moved forward on initiatives aimed at cementing ties across Latin Americ…