Final answer:
The paragraph discusses the rise and fall of civilizations throughout history and the factors that contribute to their demise. It highlights the importance of widespread civilization in preventing destruction by barbarians. However, it also raises concerns about the erosion of unique cultures in a globalized world.
Step-by-step explanation:
The paragraph discusses the trend of civilizations in history to rise and ultimately fall due to various factors. While some civilizations were confined to a small group of people, making them vulnerable to invasion and destruction, modern civilization is more widespread and therefore less susceptible to this danger. The spread of civilization is facilitated by the exchange of goods, ideas, and cultures between societies. However, this spread also leads to the erosion and destruction of unique cultures and identities. Despite the benefits of civilization, there are concerns about the loss of individuality and sovereignty in a globalized world.