Long ago, there was a kingdom. 
Long ago, there were three small groups. 

This kingdom was small. But it was very busy. People sailed big ships. They traded many goods. They went to many lands. 
They traded things like silver and silk. They also got sugar and wood. This trade helped the kingdom grow. It was a golden age.
Later, a group from Japan came. They took control of the islands. But the kingdom still traded with China. This kept the kingdom going.
Many years passed. The kingdom changed into a new place. It is part of Japan now. It is a special place to learn about.
Long ago, Okinawa Island was split into three groups. 

The kingdom was small but very busy. It was a center for sea trade. 
Things changed in 1609. A group from Japan called the Satsuma Domain invaded. The kingdom stayed mostly free to trade with China. This helped Japan trade with China too. But the kingdom was under Japanese control for a long time. In 1872, the kingdom became part of Japan. It is now called Okinawa Prefecture.
The Ryukyu Kingdom was a unique land in the Ryukyu Islands. It existed from 1429 until 1872.
Before the kingdom began, Okinawa Island was divided. 

The kingdom became famous for its busy sea trade. 
In 1609, the kingdom faced a major change.
Eventually, the era of the kingdom came to an end. In 1872, the Empire of Japan reorganized it into the Ryukyu Domain. By 1879, the Meiji government abolished the domain entirely. 
The Ryukyu Kingdom was a maritime state located in the Ryukyu Islands. It existed from 1429 until 1872.
Before the unified kingdom emerged, Okinawa Island was divided into three principalities. This era is known as the Sanzan period. 
Unification occurred through the leadership of Shō Hashi. He was a leader from Chūzan who conquered Hokuzan in 1416 and Nanzan in 1429. 
As the kingdom grew, it expanded its territory to include the Amami Islands and the Sakishima Islands. 
Trade involved a wide variety of specialized goods. Ryukyuan ships carried Japanese silver, swords, fans, and lacquerware. They also traded Chinese medicinal herbs, coins, and textiles. In exchange, they brought back Southeast Asian goods like sappanwood, tin, sugar, and ivory. Between 1424 and the 1630s, official records show 150 voyages to Southeast Asia. For example, 61 of these trips were bound for Siam. This prosperous era lasted for roughly 150 years until competition from Portuguese traders and the rise of the wokou increased.
In 1609, the kingdom's political structure changed significantly following an invasion by the Satsuma Domain of Japan. This occurred after Ryukyu refused to assist Toyotomi Hideyoshi in his campaign against Korea. The invasion led to a period of "dual subordination."
The kingdom remained under this unique status for over 250 years. The Satsuma Domain established a branch office in Shuri called the Zaibankaiya to manage its influence. 
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