The separation of 'Northern Ireland' from the 'Republic of Ireland' is an example of stuck communities with very little social mobility.
<u>EXPLANATION:</u>
The partition of Ireland is the process that divided it into Northern Ireland and republic of Ireland. The island was separated on "3 May 1921".
The one separated part is still known as "Northern Ireland" which is the part of United Kingdom and another part is called republic of Ireland which is now a "sovereign state" also commonly known as Ireland.
It was separated under the government act of Ireland. After the separation they both have their own self-governing parliaments.