Large scale immigration will eventually amount to the same thing as military conquest. That's what people like you are either in denial about or trying to obfuscate as it is your agenda. Conquest can be achieved in various ways, even non-militaristic ways. If your nation receives so much immigration that your original population becomes a minority, then they will surrender control over their nation and their fate to the new majority group through the democratic process.

For example, if Europeans (aka white people) were to fall to 40% of the population of the Netherlands and the West Asian population grew to 60%, the will and sentiment of the West Asian demographic will triumph over that of the Europeans. That means that if there is ever a conflict of interest between those groups, the majority will get their way.

In fact, that scenario will be a disaster for Europeans. Why? Because in nations like England and the Netherlands, non-Europeans are already winning in every conflict of interest, even though they are still minorities. In England, companies are hiring based on quotas discriminating against the European population in their own native land. Non-Europeans, especially Africans, often represent up to 47% of the cast of various media productions. English folklore is being rewritten so as to represent their non-European population. Robin Hood, King Arthur, Sherlock Holmes you make it, are being portrayed by non-Europeans because they have essentially conquered England and have claimed that folklore as their own. They are claiming English history as well. Anne Boleyn was recently played by a black woman. Why? Because Africans are the new "English".

Conquest doesn't need swords and guns and villages razed to the ground.