World War II changed Poland's ethnic diversity because one group of people were almost eliminated. Poland was invaded and destroyed by the Russians and Germans during the war.
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Nativism declined in the Progressive Era and especially in the 1930s, when the New Deal championed diversity, and during and after World War II, when all ethnic groups were fighting for the U.S.
Since World War II Polish population was increasing, but in 2013 it started to decrease.
Since all the various ethnic groups live in the world, the world does not have a single ethnicity. Only a small region in which the vast majority of the inhabitants are of the same ethnic group can be said to "have" an ethnicity.
The connection implied in your question is incomplete as regards "a uniquely New World creation", because, however broad their ethnic diversity, all Africans arriving in America encountered not only each other, but a wide range (indeed!) of other cultural influences, radically new forms of social organization and -as importantly- an entirely new physical environment. It is meaningless to attempt to dissect the 'melting pot' into this or that separate effect, if one wishes to explain the origination of a unique New World culture. That being said, you could rephrase the question, viz., "To what extent did the original ethnic diversity of Africans affect the evolution of New World culture?" Some astute historian might be able to take a stab at that one. Note: In these considerations, the term "New World" should certainly include America, Canada, and the entirety of the Caribbean region.
polands energy resources can be desribed as
it is people of all the world
Secrete Alliances? not sure if this is right
No, The germans dressed up as Polands and attacked them self giving them reason to attack the Polands.
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This philosophy is important because it encourages people to except others of a different ethnic group, other than ourselves, and to be enlightened by the idea of a world with many different people that are but the same.
great ethnic diversity found in the region
It was because of Indian attacks, the water wasn't good, and little supplies and food
Israel is primarily composed of an immigrant population of Jews from around the world. As a result, it has a much greater diversity than most of the other states which are primarily composed of people who have lived in that area for centuries.
Germany declared war on Poland. Poland didn't have a choice.
Hitler asked the polands if he could have there land and then the war started
Komodo Dragon, Orangutan, Borobudur Temple, Batik fabrics, and our diversity (more than 300 ethnic groups) and we are the biggest archipelago in the world (17,508 islands)