The central theme in both passages is the effect of external circumstances on friendship. In both stories, the central characters have a strong bond that is broken by external events. In Passage 1, the Civil War separates Isaac and Jed as their families support opposite sides of the conflict, and they end up fighting against each other. In Passage 2, Carla and Dee's friendship is affected by their rivalry in the computer game industry. They both try to finish their game first and stop communicating, and they eventually grow apart.
However, the passages present the theme in different historical or cultural contexts. Passage 1 takes place during the American Civil War, a conflict that divided the country and pitted friends and family members against each other. The war was a traumatic event for the nation, and its effects were long-lasting. The passage shows how the conflict divided communities and how even close friends could become enemies.
On the other hand, Passage 2 takes place in the context of the competitive world of the computer game industry. The passage highlights how rivalry and competition can affect even the closest of friendships. The passage portrays a modern-day scenario where personal ambition and competition can take priority over friendship.
Overall, both passages show that external circumstances can have a profound effect on friendship, regardless of the historical or cultural context