What began as a routine Independence Day commute quickly transformed into an unsettling encounter for Roswell Encina, capturing a stark visual contrast on the nation’s 250th anniversary.Encina, president and CEO of the U.S. Capitol Historical Society, was traveling to a July 4 party in Maryland when the atmosphere inside his Washington Metro train abruptly shifted.The ride had started with typical holiday scenes: tourists and locals dressed in patriotic colors, families with children, and passengers heading toward the Smithsonian and Capitol South stations for the festivities.“It was fun to see that, you know, just average Americans, people with babies, people with...