Now, the Eastern Zhou Dynasty, this period right over here between 770 BCE and 476 BCE, often known as the spring and autumn periods, this is often referred to as a significant period of philosophical golden age in China. It was the time of Confucius. It was the time of Lao Tzu, who comes up with the Dao or the core of the Dao philosophy. So a lot of major philosophical underpinnings of even modern China start to emerge in this time. Now, at the latter half of the Eastern Zhou period, you have the Warring States period, and that's where you see these dotted lines, and the Zhou Dynasty, which was already very decentralized, becomes even more fragmented, and China really doesn't get well unified again until 221 BCE. In 221 BCE, you have the emergence of the Qin Dynasty, and even though the Qin Dynasty is very short-lived, it only lasts a few decades, it's significant in that it's the first really strong central dynasty. It's often referred to as the first imperial dynasty.