Answer
The answer to the question of Dos Passos' artistic influence for his book covers is Modernism. Modernism was a dominant artistic style in the early 20th century, characterized by a departure from traditional forms and a focus on experimentation, fragmentation, and subjectivity. This style influenced Dos Passos' approach to book cover design, resulting in visually striking and unconventional covers that reflected the modernist spirit of his literary works.