What did churchill mean by the iron curtain?

Church hill stated in a speech "A shadow has fallen across the scenes so lately lighted by Allied victory. From Stettin in the Baltic to Trieste in the Adriatic, an iron curtain has descended across the continent." We know that there was a a conference called the Potsdam Conference where the Allie powers of Great Britain, France, the U.S., and the Soviet Union agreed that  Germany was going to be divided into four occupation zones, and each country would get one. There was a political divide between West Europe and Communist Europe. Western Germany was now a capitalist country and  Eastern Germany was now a communist country. So what Church hill meant when he metaphorically said "iron curtain" he meant a political divide between Western and Eastern Europe.

in the 1800s, chinese workers migrated to the united states, first to work in the gold mines, but also to take agricultural jobs, and factory work, especially in the garment industry. chinese immigrants were particularly instrumental in building railroads in the american west, and as chinese laborers grew successful in the united states, a number of them became entrepreneurs in their own right. as the numbers of chinese laborers increased, so did the strength of anti-chinese sentiment among other workers in the american economy. this finally resulted in legislation that aimed to limit future immigration of chinese workers to the united states, and threatened to sour diplomatic relations between the united states and china.

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