The Uesugi clan was a group of people who lived in Japan a very long time ago. They were like a big family with a special name. They lived in a place called Echigo and were very powerful.
The Uesugi clan had a leader called a daimyo, who was like a king. He was in charge of all the people in the clan and had lots of soldiers to protect him and fight for him.
The Uesugi clan was very good at fighting and they won many battles. They were also very smart and had lots of important people in their clan. One of the most famous members of the Uesugi clan was a man named Uesugi Kenshin. He was a great warrior who fought in many battles and was known as one of the greatest swordsmen in all of Japan.
The Uesugi clan was very important in Japanese history and many people still talk about them today.