From the excerpt from Dante's literary piece "like clouds of sand caught up in a whirlwind (iii, 30)"
Dante used the literary device, simile and personification. He used the word "like" to compare something with the clouds. And personification, "clouds of sand caught up in a whirlwind"
The detail in the passage that supports the idea that economic life was difficult in China is the following one:
As a result of wars, famine, and political oppression, Chinese immigration to the United States dates back to the mid-1800s.
Chinese immigrants came to the United States looking for better economic opportunities so they could provide for their families and send money to their relatives back home.