
A portrait of Zhang Heng, the greatest inventor of the Han dynasty.
Economy
There were many reforms in the economy of China during the Han dynasty. There were lots of changes in the agriculture and trade for the good of the nation. First of all, emperor Wu Di sent a representative of China to explore the regions west of China several times. When his representative returned from his expedition into Central Asia and as far as the Middle East, emperor Wu Di became interested in making commercial relations with them. By 100 BCE, this famous trade route was fully developed with roads and was named the "Silk Road". This trade flourished the economy of China. Some western trade goods included silk, ivory, incense, and gold. Trade between China and their farthest trade partners, Rome, had been recorded to be a success. Also, the Chinese built more and better roads within China itself to improve communication and transportation. Agriculture was also improved by more efficient irrigation, water pumps, water ways, hydraulic waterwheels, and oxen-pulled carts. These agriculture reforms also led to improving the economy. The Chinese also introduced a standardized form of currency, a new coin, in the whole nation. This would prevent any further use of the barter system, which was very inefficient and inaccurate causing more trade and freedom to buy what each person wants.
There were also a some different social changes during the Han dynasty. Firstly, religion and philosophy played a huge role in the everyday life of the Chinese during the Han dynasty and many dynasties after it. More of the Chinese people started to base their arts and everyday actions on the philosophies instead of the laws. Also, there were more job opportunities in many fields including merchants, higher-paid farmers, builders, government workers, and many others. Getting government jobs were made based on test results instead of status, reputation, and wealth improving opportunities. Private contracts were also set-up for use on property ownership and loans improving the organization of the society.
Government Changes
There were countless government changes during the Han dynasty. The government itself was divided into 2 parts: central government and the local government. The central government was located at the capital by 12 ministers and controlled the bigger laws such as the taxes, the trading regulations, and many others. The local government was located in each county or sub-county (known as "xian"). There were a total of 1,180 xian or 1,180 local governments which controlled smaller laws such as the military policies, economic policies, and cultural laws. There were also new taxes during the Han dynasty. Firstly, every adult had to pay a "poll tax" of 120 coins every year. In addition, all male adults had to do labor for the government one month every year with no exceptions even if they were building a new city which is better than the previous dynasties since they would just force all males to work on a new project until it was finished, which might take a few years. Agricultural taxes was also greatly reduced to a low rate of one-thirteenth of the harvest. In the year 3 CE, emperor Liu Kan (nicknamed Ping Di) set-up a nationwide government school system to educate the children of the philosophies and rules in the Han dynasty. The Han government greatly improved China's infrastructure.

A government watchtower built with many variations in many counties.
Religion and Philosophy
The religion and philosophy changes were probably the most important set of achievements during the Han dynasty. At the start of the Han dynasty, Qin principles and philosophies were used for a few years. After that, emperor Liu Bang divided the country into several different feudal states to form a feudal system. However, after he died, his successors tried to rule China with a combined form of Tao philosophies and Legalist methods. They succeeded in making a centralized government over China with several taxation and agriculture advances. This continued until emperor Liu Che (nicknamed Wu Di) came to power. He declared that Taoism should not exist and made China a Confucian country with a few variations of Legalist methods. This change made knowing the Confucian Classics, as a test, compulsory to get a government job. This greatly improved the status of the scholars and made education a priority to everyone in China. Emperor Liu Che took the Han dynasty through a period of development with lots of technological discoveries, military expansions, new talents in people, and foreign trading. This trade eventually led to the introduction of Buddhism into China when contacts with the Kushan Empire in present-day India were found to be Buddhist preachers.

This symbol is known as Taijitu, a popular symbol from Taoism.
Fall of the Han Dynasty
After the death of emperor Liu Da (nicknamed Zhang Di) in 88 CE, the Han Dynasty fell into the hands of bad leaders with corruption and power struggles. The emperors lost most of their power and China was ruled by 3 powerful groups: Confucian scholar-officials, empresses' clans, and eunuchs. When these groups could not agree on any beneficial change to make, the peasants started a revolution and eventually, the Han dynasty was split into 3 bringing the period of the "Three Kingdoms". Finally, in 220 CE, Cao Pi removed the powerless emperor Liu Xie (nicknamed Xian Di) by force to bring an end to once mighty Han dynasty. The greatest dynasty in Chinese history had come to an end.
A map of the "Three Kingdoms" after the fall of the great Han Dynasty.
Bibliography
http://en.wikipedia.org/wiki/Han_Dynasty
http://www.hyperhistory.net/apwh/essays/comp/cw07hanromecollapse33100120.htm
http://www.metmuseum.org/toah/hd/hand/hd_hand.htm
http://en.wikipedia.org/wiki/Confucian
http://en.wikipedia.org/wiki/Taoism
http://en.wikipedia.org/wiki/Emperor_Han_Wudi_of_China
http://en.wikipedia.org/wiki/Zhang_Heng
http://www.travelchinaguide.com/intro/history/han/
http://en.wikipedia.org/wiki/Silk_Road
Famous Han Quote
"Seeing it once is better than being told 100 times."
- Zhou Chonggou (Han Dynasty)