The Israeli-Palestinian conflict is the knottiest border problem of all.
The historical events of 1948 and 1967 loom large in the formation of the borders in the region of Israel/Palestine. This is the most contentious border in the world, in part because of the competing political/cultural factions. To complicate matters, other countries (most notably the United States and European countries siding with Israel and Arab states with other Muslim-majority countries supporting Palestine) are involved in the region, making this the most contentious border in the world. As Frank Jacobs said, “considering how deep those divisions are, it’s remarkable how relatively new the current set of borders is.” This is an intriguing analysis of an incredibly important set of borders that have larger geographic repercussions despite the short distances and relatively small populations involved.