Video Duration 03 minutes 45 seconds

How Northern Ireland conflicts helped lead to Brexit

Possible return of checkpoints between Irish Republic and Northern Ireland is a major concern, not just on trade but on peace too.

One of the main Brexit sticking points is what happens on the divided island of Ireland.

The possible return of checkpoints between the Irish Republic and Northern Ireland is a major concern – not just on trade but on peace too.

This is especially true in the second largest city in the north, which has been at the forefront of decades of sectarian conflict.

Al Jazeera’s Charles Stratford reports from Londonderry, also known as Derry.