BRUSSELS—Europe, for centuries a patchwork of warring kingdoms and principalities, is again showing its colors. Today, resurgent nationalism and regionalism are evident in a mushrooming of historical local flags. Catalan separatists are flying the nearly century-old Estelada, an unofficial flag with a white star on a blue triangle—a symbol of independence from Spanish rule—above the red-and-yellow striped official Catalan flag. German far-right protesters have revived a flag designed by a critic of Adolf Hitler. Hungary’s...

Source: Wall Street Journal January 03, 2018 12:00 UTC