One hundred fifty people are sworn in as US citizens today on the lawn of George Washington's Mount Vernon estate, in a naturalization that marks the nation's 250th birthday and draws representatives from roughly 50 countries.New citizens include U.S. Marine Sergeant Diakaria Sangare from Guinea and Martha Beyreuther from Germany, who rose from a live‑in maid to a senior manager at Amazon; speakers include Douglas Bradburn and representatives of the Mount Vernon Ladies' Association and U.S. Citizenship and Immigration Services.Organizers urge the new citizens to register to vote, while hundreds of family members attend despite record heat in Northern Virginia and speakers frame the ceremony as a statement about diversity, resilience and civic inclusion.