By Lananh Nguyen NEW YORK (Reuters) – UBS is reshuffling its U.S. wealth leadership to focus on southern states that are crucial to the division’s growth as affluent families increasingly migrate to Florida and Texas, the company said on Thursday. The new structure for the world’s largest wealth manager signals a big push into the southern United States alongside competitors such as Merrill Lynch Wealth Management, which has boosted its presence in Florida. “We’ve seen our clients do well in the last decade in terms of their investment outcomes,” said Jason Chandler, head of UBS wealth managem…