Chinese immigrants were cast as outcasts in Californian society, because of cultural differences - customs, clothing, beliefs, food, language etc -. The response to those differences caused Chinese immigrants to form their own community called Chinatowns.
Nativists thought Chinatowns were dangerous but necessary to help Chinese immigrants to assimilate, they also thought Chinatown was useful because it was used to separate immigrants from other residents.
They were in the middle of the desert. It would be a large risk to trek through such a large desert to attack them.
If I remember from last year, it is true because the leaders let the people keep their cultures as to prevent from any revolts and such.
In the 1930s, as a reply to the increasing agitation in Europe and Asia that would eventually lead to World War II, the United States Congress passed the Neutrality Acts. These were impelled by the growing isolationism and non-interventionism policy that followed the expensive involvement in World War I and aimed to guarantee that the country would not become compromised over foreign conflicts again.
In 1941 the Neutrality Acts were widely repealed. The Lend-Lease policy aimed to defeat Germany, Japan, and Italy by distributing supplies between 1941 and 1945 put an end to the United States' pretense of neutrality.
The one of the reason's why the Allies allied themselves with the soviets was because they wanted to open a new front. The Soviet Front would be so massive and would force Axis's units to spread even more, and to spread resources more. Though they were already spread out.