Why were there so many great men of religious philosophy in the Eastern and Western worlds four or five hundred years before the birth of Jesus?

In the four or five hundred years before the birth of Jesus, there were so many great men of religion and philosophy in the eastern and western worlds at the same time. The main reason was that during this period of time, the world situation was turbulent, and great changes had taken place in politics, economy, culture, and other aspects. These factors all promoted the development of human thought and culture. In the 400 - 500 years before the birth of Jesus, the western world experienced the collapse of the Roman Empire and the rise of the Renaissance, which made humans have a deeper understanding of nature, humanity and society. The eastern world, on the other hand, experienced the Warring States Period in China, the expansion of Buddhism, and the rise of Buddhism. These factors had a profound impact on human thought and culture. In addition, the development of science and technology during this period had also affected human thinking and culture. In the Western world, the emergence of Copernicus's Heliocentric Theory and Bruno's Inquisition challenged the traditional view of the universe and religion; in the Eastern world, the invention of paper and gunpowder made it easier for humans to communicate with literature and knowledge, and also promoted the development of philosophy and science. To sum up, in the four or five hundred years before the birth of Jesus, the world was in turmoil, and great changes had taken place in politics, economy, culture and other aspects. These factors had promoted the development of human thought and culture. The development of science and technology also had an impact on human thought and culture. These factors together contributed to the emergence of so many great religious and philosophical figures during this period.