Mexican president Enrique Peña Nieto: ‘most important measures in decades’Commentators urge caution – ‘there is still a lot to explain’Barack Obama: we are and always will be a nation of immigrantsLatin American governments have enthusiastically welcomed President Barack Obama’s announcement of sweeping immigration reforms, though some activists and commentators have stressed its limitations.Mexico’s president, Enrique Peña Nieto, described the reforms on Friday as the “most important measures taken in several decades”, adding that the actions would allow families to stay together.