Why did many people not accept the new national boundaries of europe?

Many people did not accept the new national boundaries of Europe due to a sense of ethnic and cultural identity that did not align with the imposed borders. The redrawing of boundaries often disregarded historical ties and the complexities of local Demographics, leading to discontent among various groups. Additionally, the arbitrary nature of some boundaries, established after events like World War I and World War II, fostered feelings of injustice and resentment, as communities found themselves divided or forced into new national identities that did not reflect their heritage. This discontent often fueled nationalist movements and conflicts in the following decades.