The Constitution is the fundamental law of China. Why does this sentence make a logical mistake with too wide a definition?

The definition is too wide, that is, the extension of the defined item is greater than that of the defined item, and the defined item does contain the defined item, resulting in the inclusion of objects that do not belong to the extension of the defined item. For example, the constitution is the fundamental law of the country, but not only China has a constitution, so the constitution is not the fundamental law of China, the constitution of People's Republic of China (PRC) is the fundamental law of China, but the constitution of Japan is not the fundamental law of China, and the constitution of China is not the fundamental law of Japan. Therefore, the constitution is a defined item, while the fundamental law of our country is a defined item, and the defined item is greater than the extension of the defined item, so it makes the mistake of too wide logical definition. I hope I can help you.