As the United States marks the 250th anniversary of its founding, Puerto Rico, too, has cause for celebration, notes contributing STAR columnist Gregorio Igartúa. Puerto Rico — time to celebrate! By GREGORIO IGARTÚA DE LA ROSA Special to The STAR The year 2026 holds great historical significance for our nation, marking the 250th anniversary of its founding in 1775. Given the importance of this event, impactful cultural activities have been organized — particularly in the capital, Washington,…