In the meantime, the membership of the union changed from being predominantly Jewish and Italian to drawing on the latest wave of immigrant workers: largely from Puerto Rico, the Dominican Republic and China in New York and other east coast cities and from Mexico, Central America, and Asia in Los Angeles and other western and southern centers of the industry. The leadership of the union had less and less in common with its membership and very often had no experience in the trade itself. The union won few gains in workers' wages and benefits in the years after World War II and gradually lost its ability to keep sweatshop conditions from returning, even in the former center of its strength in New York.