Final answer:
The difficulty in finding the poems on the walls of Angel Island was caused by limited access to the walls, fading and deterioration of the writing, and the overcrowding of messages.
Step-by-step explanation:
According to "The Writing on the Wall," the factors that made it difficult for people to find the poems on the walls of Angel Island include Limited access to the walls, Fading and deterioration of the writing, and Overcrowding of messages. These poems, carved by detainees who faced uncertain futures and long periods of confinement, offer a poignant insight into their experiences. Over time, the writing became harder to discern due to the natural processes of deterioration, and the sheer volume of inscriptions made it challenging to distinguish individual messages.