MEXICO CITY – President Andrés Manuel López Obrador said Friday that he expects more caravans of Central American migrants and asylum seekers to emerge, but he sees the phenomenon that became a political football in the United States in recent years as waning. A week after armored National Guard troops and immigration agents broke up what was left of the most recent caravan in southern Mexico, loading men, women and children onto buses for likely deportation, López Obrador suggested that fewer will come in future groups. “Surely they are organizing other caravans.