The last time gasoline was this cheap, 4% inflation seemed alarming, JD Vance was still a private citizen and the United States had only just begun its messy withdrawal from Afghanistan. Gas prices dropped below an average of $3 a gallon in the United States on Tuesday for the first time in four-and-a-half years, according to AAA. The milestone represents a rare feel-good story in a years-long affordability crisis marked by high prices for necessities. The national average for regular gas dipped to $2.998 a gallon, compared with $3.001 on Monday. Pump prices are down about six cents in just...