By Sarah Morland and Marion Giraldo MEXICO CITY (Reuters) – Cultural ministers and representatives from 150 countries committed to expanding efforts to return historical artifacts to their countries of origin, according to a declaration released on Friday, following a UNESCO conference in Mexico City. Major museums, auction houses and private collectors have faced growing pressure in recent years to repatriate priceless works of art and other antiquities from Latin American and African nations, among others, which argue the goods were often taken unethically or illegally. The declaration from …