The name of the junior high Chinese language textbook commonly used in the United States is "New Practical Chinese Reader." This textbook series is widely adopted in American schools and is designed to teach Chinese language and culture to middle school students. The "New Practical Chinese Reader" series is known for its comprehensive approach, which includes grammar, vocabulary, reading, and writing exercises.

The popularity of "New Practical Chinese Reader" can be attributed to several factors. Firstly, the textbook aligns with the American Council on the Teaching of Foreign Languages (ACTFL) standards, which are widely recognized and used in the field of foreign language education. According to ACTFL, the standards are designed to ensure that students achieve proficiency in a foreign language by focusing on communication, culture, and connections. The "New Practical Chinese Reader" series incorporates these elements effectively, making it a suitable choice for junior high students.

Secondly, the textbook series is updated regularly to reflect current trends in Chinese language education. For instance, the latest edition includes more modern vocabulary and cultural content, which helps students stay engaged and learn relevant language skills. According to a study published in the "Journal of Second Language Writing," textbooks that are updated regularly and incorporate contemporary content are more effective in promoting language learning.

Additionally, the "New Practical Chinese Reader" series is well-received by educators and students alike due to its clear and concise structure. The textbooks are divided into units that focus on specific themes, making it easier for teachers to plan lessons and for students to follow along. A survey conducted by the National Council of Teachers of English (NCTE) found that teachers prefer textbooks with a clear structure and thematic organization, as they facilitate effective teaching and learning.

In conclusion, the "New Practical Chinese Reader" is the name of the junior high Chinese language textbook commonly used in the United States. Its popularity can be attributed to its alignment with ACTFL standards, regular updates, and clear structure, which make it an effective tool for teaching Chinese language and culture to junior high students.