Rosario (Spanish pronunciation: [roˈsarjo]) is the largest city in the province of Santa Fe, in central Argentina. It is located 300 km (186 mi) northwest of Buenos Aires, on the western shore of the Paraná River.
Tum h o kon aur meri tarah kyun bani hui h o aur
Answer: ...have obtained independence during post-war period (during 1950s, 1960s and 1970s).
Explanation: we have to include Dutch (Surinam for example), French (Algeria or Vietnam), Belgian (Kongo-Kinshassa) or Portuguese (Angola, Mozambique) colonies. This process included return of white-Europeans colonists back to Europe: the biggest return was that of Algerian French (Pieds-Noirs) and later (not so big) European whites from Portuguese territories (1974-1975-1976).
