structural:summarization, stylistic:style_transfer
Drawing new borders

In determining international borders between sovereign states, self-determination has yielded to a number of other principles. Once groups exercise self-determination through secession, the issue of the proposed borders may prove more controversial than the fact of secession. The bloody Yugoslav Wars in the 1990s were related mostly to border issues because the international community applied a version of uti possidetis juris in transforming the existing internal borders of the various Yugoslav republics into international borders, despite the conflicts of ethnic groups within those boundaries. In the 1990s indigenous populations of the northern two-thirds of Quebec province opposed being incorporated into a Quebec nation and stated a determination to resist it by force.

The border between Northern Ireland and the Irish Free State was based on the borders of existing counties and did not include all of historic Ulster. A Boundary Commission was established to consider re-drawing it. Its proposals, which amounted to a small net transfer to the Free State, were leaked to the press and then not acted upon. In December 1925, the governments of the Irish Free State, Northern Ireland, and the United Kingdom agreed to accept the existing border.