Why do you think Emperor Wen allowed the practice of Confucianism, Daoism, and
Buddhism?

Emperor was the founder and the first emperor of China's Sui Dynasty.

Explanation:

He was a hard working administrator and practice Buddhism and Confucian teachings in his regime. He was also known to be the ruler who had a less number of concubines. He was a ruler who never believed or resorted to violence for personal gains but he attacked and usurped lands in order to expand the kingdom.

During his reign Chins' Great wall was rebuilt. He behaved as the perfect Confucianist because he never complained.  Emperor Wen was a visionary individual and possessed definite integrity of character. he never succumbed to the evils of sensory pleasures. it was the teachings of Confucianism, Buddhism and Taoism which molded him to be an ideal emperor who worked and introduced reforms for the benefit of the commoners.  

during the middle ages bibles and most christian literature was written in latin i think that’s the answer you are looking for

it provided for equal trade rights among nations in china.