Poland votes that WWII massacre by Ukraine was ‘genocide’

[uawchild]

1. Poland is the most ethnically homogeneous nation in Europe

"Ethnically, Poland is a very homogeneous country, with 96.7% of population being Polish."
https://en.wikipedia.org/wiki/Demographics_of_Poland

This is in large part due to the ethnic cleansing and mass murders that took place during the WWII era.
Germany murdered the vast majority of Poland's large Jewish Population.
Poles and Ukrainians ethnic cleansed each other during WWII, as the OP describes.
The Soviets ethnically cleansed the German population in what is now Poland.


Also in regards to non-citizens, Poland is very homogeneous there to:

"Poland has the lowest proportion of foreigners in the European Union, with foreign citizens making up just 0.3 percent of the population."
http://www.thenews.pl/1/10/Artykul/233898,Poland-most-homogeneous-in-EU

This bit falls more on the recent and current Polish governments. For example:

Poland refuses to take a single refugee because of 'security' fears
http://www.independent.co.uk/news/world/europe/poland-refuses-to-take-a-single-refugee-because-of-security-fears-a7020076.html