The first reason, is that there were terrible living conditions for the workers. They only got $3 a month and were charged for passage,food, clothing, and housing. The Chinese were taken to grass houses with dirt floors, and sometimes as much as forty men were put into one room. Before, going to the field they would get a bowl of rice before the work actually happens.
My second reason, there was miserable working conditions for the workers. They had shifts from 6:00 am to 4:30 pm they would have 10 hours of back breaking work. For example the weed-clearing crews