Language barriers, some fled from poverty and religious persecution but encountered them in America
Many lost jobs is the best answer I have hope it help
The mandate of Heaven was the idea that the gods gave the power to rule to ancient Chinese governments. If the government became corrupt because of overtaxing, Natural disasters or the common people revolted because of mistreatment, they believed that the government had lost the mandate of heaven and then the commoners established a new government to rule. This was a reoccurring cycle.
There are 7 days in a week (:
