Following the reunification of Vietnam in 1975, Northern and North-Central speakers from the densely populated Red River Delta and the traditionally poorer provinces of Nghệ An, Hà Tĩnh, and Quảng Bình have continued to move South to look for better economic opportunities, beginning with the new government's "New Economic Zones program" which lasted from 1975 to 1985. The first half of the program (1975–80), resulted in 1.3 million people sent to the New Economic Zones (NEZs), majority of which were relocated to the southern half of the country in previously uninhabited areas, of which 550,000 were Northerners. The second half (1981–85) saw almost 1 million Northerners relocated to the NEZs. Government and military personnel from Northern and North-central Vietnam are also posted to various locations throughout the country, often away from their home regions. More recently, the growth of the free market system has resulted in increased interregional movement and relations between distant parts of Vietnam through business and travel. These movements have also resulted in some blending of dialects, but more significantly, have made the Northern dialect more easily understood in the South and vice versa. Most Southerners, when singing modern/old popular Vietnamese songs or addressing the public, do so in the standardized accent if possible (which is Northern pronunciation). This is true in Vietnam as well as in overseas Vietnamese communities.