Former Brazilian President Lula da Silva is set to become the new president of Brazil, beginning on New Year's Day. This will be Lula's third term after his previous tenure between 2003 and 2010. His comeback is seen to have cemented a leftist momentum across Latin America, including Mexico, Argentina, and Colombia. What propelled the return of Lula? Why is Latin America tilting left? What could be its regional and even international implications?