Just two years after Columbus in 1494, the Treaty of Tordesillas divided the Atlantic Ocean between Spain and Portugal.

The Treaty of Verdun in 843 divided the region into Middle and West Francia.

The Anglo-Irish Treaty divided the Labour Party.

The Treaty of Verdun (843) happened several generations after Charlemagne and divided his empire into three parts.

This was resolved by Papal intervention in 1494 when the Treaty of Tordesillas purported to divide the world between the two powers.

The Anglo-Irish Treaty divided the Labour party.

The Treaty of Verdun divides the Carolingian empire into three parts.

The Treaty of Turkmenchay of 1828 once again divided the traditional Armenian homeland.

In 843, the Treaty of Verdun divided up Charlemagne's empire.

To avoid conflict, the Treaty of Tordesillas divided the world into Portuguese and Castilian hemispheres of influence.