After the Treaty of Nanking, why was China forced to sign similar treaties with the United States, France, and Russia?

-China was not forced to sign treaties with the U.S., France, and Russia.
-These Western imperialist powers saw that Great Britain had not gained money and power through the Treaty of Nanking and they wanted to try to get some.
-These Western imperialist powers saw that Great Britain had gained money and power through the Treaty of Nanking and they wanted the same for themselves.
-The U.S., France, and Russia saw that Great Britain had gained money and power through the Treaty of Nanking and they wanted to teach Great Britain a lesson.

-These Western imperialist powers saw that Great Britain had gained money and power through the Treaty of Nanking and they wanted the same for themselves.