What are the main contents and artistic features of Li Bai's poems? Why are there these characteristics? ________________________________________

The content is characterized by praising the prosperity of the motherland and the magnificence of rivers and mountains; Artistic features are unrestrained, imaginative and exaggerated. Reasons: ① China has a vast territory and magnificent rivers and mountains. ② The national strength of the Tang Dynasty was strong and highly prosperous. (3) Li Bai is uninhibited, greatly influenced by Taoist thought, pursuing illusion, hoping to achieve immortality, and being good at imagination and exaggeration.