Is making peace hard? A quarter of a century has passed since militants agreed the Good Friday Agreement to bring peace to Northern Ireland. But did the conflict ever really end?
Ireland torn by drugs, debt and kneecappings
Watching: Murals have become symbols of Northern Ireland, marking out republican and loyalist areas. Glossary
Joe Biden - An American politician who was the 46th president of the United States from 2021 to 2025.
Belfast - The capital of Northern Ireland.
Good Friday Agreement - The treaty that ended the Troubles, a decades-long conflict between Catholics and Protestants in Northern Ireland, which also saw fighting between the British government and Irish republicans. One of its central tenets is an open border between Northern Ireland and the Republic of Ireland.
Republicans - People who believe a country should not have a king or queen, or in the US, members of the Republican party.
Loyalists - Loyalists believe Northern Ireland should remain a part of the UK and are usually Protestants.
Paramilitary - An unofficial group organised like a military force.
IRA - The Irish Republican Army, or IRA, was an unofficial military organization made up of people who wanted an end to British rule in Northern Ireland.
PR - Public Relations — the practice of managing how others see a brand or person.
Ceasefire - An end to fighting — often temporary.