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.

richard allen was a minister for a african methodist episcopal church. he was also a educator and a writer one of america most active and influential black leaders. in 1794, he founded a african methodist episcopal church in philadelphia, pennsylvania. the church that he founded was the first independent african american denomination in the united states. he was a influential leader that makes many people feel comfortable under his preachings. they trusted him and supported him even though it could get them in trouble because slavery was happening. he risked his life to bring slaves and others closer to god and writing books. as a boy he and his family were slaves but some how he managed to teach himself how to read, write and preach. he has written four books about his life, slavery and hymns/preaching.

idk you know what i mean hahahaha