After the conquest of the Mediterranean world, the increase in wealth, the change in economic structure, and the influx of foreign thoughts made the Romans feel bewildered, and the pursuit of value showed a strange appearance. The vast majority of Romans abandoned traditional social virtues and pursued happiness. Philosophical philosophy, worship of money, covetous ease, indulgence in food and hue, the Roman nation gradually drifted away from traditional virtues in terms of life value. After the formation of the Roman Empire, the traditional virtues that the Romans were proud of disappeared, and the moral disintegration Caused the decline of the Roman Empire. What is the main point of the above text? ['After the Romans conquered the Mediterranean world, they began to abandon traditional social virtues.', 'Morality determines the rise and fall of a nation.', 'The moral decline led to the decline of the Roman Empire.', 'The Roman nation used to have traditional virtues.']