Republic of Suriname (independent, modern)
Who & why: Suriname becomes independent from the Netherlands on 25 November 1975, and this flag — adopted that same year — has flown unchanged ever since. The country's population, shaped by Dutch, African-Maroon, Hindustani (Indian-descended), Javanese/Indonesian, and Chinese migration and labor history, is genuinely one of the most ethnically diverse in South America.
What it represents: the yellow five-pointed star centered on the red band stands for national unity and the sacrifice of all of Suriname's ethnic groups; the colors represent agriculture (green), justice and the road to independence (red), and the country's progressive future (yellow, via the star).