Let us take the social impact first. Mass immigration is undemocratic. We were never asked by any government if we wished to open our borders to the rest of the world, but every government over the last 50 years has opened our borders and the results are only to be expected. If you import the Third World, you become the Third World.
When one race invades the homeland of another race it does so in order to acquire territory and to impose its own culture. Conversely, the invaded group resists in order to preserve his race, his territory and his culture, not simply because he is a racist and dislikes the skin colour of the invader. Or at least that is historically how things were.
The people of the West today are ceding territory, tradition, and culture, and do so in the face of imminent minority status, whilst the incomer makes no pretence of his intentions in his avowal of Islamic mono-cultural superiority.
To resist is to be called a racist, yet no one was called a racist in 1939 when we went to war with a different race and culture that wished to enter our homeland, overthrow our elected government, murder the Jews and homosexuals and consign our remaining citizens to second-class status.
Multiculturalism, when viewed through the conservative prism of racial reality rather than the liberal prism of a multiracial and multi-religious utopia can lead to only one logical conclusion, to wit, Western countries are in the process of unopposed invasion and are submitting in their entirety.
Multiculturalism as practiced in the West today is an ideology of territorial and political aggression by the anti-Western invader and the submissive ideology of state-sanctioned white European appeasement.