What was a key to development that occurred globally during the classical era?

A key development that occurred globally during the classical era (roughly 500 BCE to 500 CE) was the rise of complex civilizations and empires.

Here's why this was significant:

* Political and Social Organization: Classical civilizations developed sophisticated systems of government, with empires like the Roman Empire, the Han Dynasty in China, and the Gupta Empire in India. These empires established laws, bureaucracies, and military forces, which allowed for greater control over large territories.

* Economic Growth: These empires facilitated trade networks, connecting different regions and leading to economic growth. The Silk Road, connecting China to the Roman Empire, is a prime example of this.

* Cultural Development: Classical civilizations produced monumental works of art, literature, philosophy, and science. Think of the Parthenon in Athens, the Confucian Analects in China, and the Roman legal system. This intellectual and artistic flourishing was a hallmark of the era.

* Spread of Ideas: The expansion of these empires led to the diffusion of ideas, technologies, and cultural practices across vast areas. This exchange of knowledge contributed to advancements in agriculture, medicine, mathematics, and other fields.

The rise of these complex civilizations and empires during the classical era significantly shaped the course of human history, laying the foundation for later developments and influencing the world even today.