Answer:
Eckels and his companions return from their safari, with Eckels causing havoc by panicking and murdering an ancient butterfly. It is now shown that he actually altered history, not just the location. Deutscher notices the revised wording on the safari sign, and this alerts him to the fact that the future has changed then he finds that in this alternate reality, Deutscher has taken over as president.
Step-by-step explanation:
The novella "A Sound of Thunder" explores and criticizes arrogance when individuals misuse modern technology. It's set in two time periods: the Mesozoic Era and the "present-day" in the United States.