Some national flags look almost identical. Once you know the tell-tale differences, a shade of blue here, a reversed stripe order there, you'll rarely mix them up again.
These two are about as close to identical as national flags get, blue, yellow and red vertical stripes on both, with Chad's blue running slightly more indigo than Romania's. They're close enough that in 2004, Chad's government formally complained to the United Nations, pointing out that Romania's flag (which predates Chad's own by roughly a century) was now essentially indistinguishable from theirs and asking Romania to change it. Romania didn't. The flags remain, to this day, near-copies of each other purely by coincidence, neither country designed its flag with the other in mind.
Both flags are a plain red stripe over a white one, nothing else. The genuine difference is proportions: Indonesia's flag is a 2:3 ratio, noticeably wider relative to its height than Monaco's 4:5. Monaco's version actually has the older claim, tracing back to the colours of the House of Grimaldi, the ruling family, in the 14th century, while Indonesia adopted its flag in 1945 for entirely unrelated reasons tied to old Majapahit empire colours. Neither country copied the other. Two completely different histories just happened to land on the same two colours in the same order.
Green, white and orange for Ireland; orange, white and green for Ivory Coast, the exact same three colours with the order flipped. Ireland's flag dates to 1848, a gift from French sympathisers during a period of revolutionary solidarity across Europe, with the colours meant to represent Irish Catholics (green) and Irish Protestants of British descent (orange), with the white stripe standing for peace between the two. Ivory Coast's flag, adopted over a century later in 1959, has nothing to do with Ireland's design or symbolism at all, orange for the northern savannahs, white for peace and unity, green for the southern forests. Same colours, unrelated countries, unrelated stories, just a reversed stripe order standing between total visual confusion.
Unlike the other three pairs, this one isn't coincidence. Luxembourg spent decades in personal union with the Dutch crown during the 19th century, sharing the same monarch even after Luxembourg gained its own independence in 1839, and its flag grew directly out of that shared history with the Netherlands' own red-white-blue. The two flags have since drifted apart slightly, Luxembourg's blue reads as a noticeably lighter, paler sky blue next to the Netherlands' deeper cobalt, and Luxembourg's proportions run a little longer, but the resemblance here is a real shared bloodline, not a coincidence like the other three pairs on this list.
When a pie chart looks like an exact match for one of these pairs, check the hints before locking in a guess, population and continent will usually separate them instantly even when the colours alone can't.
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