If I understand your question, real life would have pretty much followed the film. Curfew in areas where the ants had been seen, National Guard/military presence, expert scientists being asked for advice, people detained and information withheld to avoid panic. The film is almost a template for response to an unknown attacker.
What was unique about the film is that people in power actually listened to the experts (the scientists). If the film had been made 20 years later, some gung-ho general would have bombed the nests before checking to see if the queens were still there.
“We’d lock up all the Ay-Rabs in detention centers and waterboard them until the ants descended upon every major city in the US. And even after that, some evil General would still be torturing John Q. Persian about how he created these affronts to God!”
Right? Because otherwise, I don’t see what 9/11 has to do with giant ants.
ETA: I guess I midread the OP. Bosda wanted to know what would have happened in 1954. Since my parents weren’t even born yet, I’m going to guess the movie was pretty accurate.
Hah! By modern standards, he was a bleeding-heart liberal! Spoke out against the military-industrial complex as a huge problem for America and spent huge amounts of money on infrastructure to combat a recession!
Which, joking aside, kind of points up the difficulty of the question … apples and oranges, the difference between then and now. We probably WOULD have had the CIA and the FBI looking into the possibility that Commies or Commie sympathizers had introduced the ants into America to destroy our precious … sugar …
Actually, the MI complex would have tried to replicate the enormous growth of the ants under controlled conditions and tried to train to be living mobile weapons. Imagine the conflicts in Southeast Asia with American-trained giAnts ferreting out NKVD cells. OTOH, the Communists might have bought Japanese-bred giant lizards on the sly to retaliate.
Yes, the Russians tried this as well, but the only success they had was breeding giant rabbits. Not terribly scary, but it put the mink coat industry out of business.