The answer to this question is very complex as the events which brought about Northern Ireland spans several centuries, the following links will give you the full history:
http://en.wikipedia.org/wiki/Northern_ireland
http://en.wikipedia.org/wiki/History_of_Ireland#Protestant_Ascendancy_.281691.E2.80.931801.29
But I will try to summarise it...
Henry VIII in 1536 set out to re-conquer Ireland to bring it under the control of the crown, this took nearly a century to complete and spanned the reigns of Elizabeth and James I.
From the mid 16th and into the early 17th century crown governments tried to create plantations in Laois and Offaly, Munster and Ulster. The plantations in Ulster were the most successfull.
In the 1800's the Kingdom of Ireland was merged with Kingdom of Great Britain under the Act of Union by both Irish and British parliaments.
The Home Rule bill was passed in 1910 and the thrid Home Rule Bill was passed in 1912. However the onset of World War 1 delayed the implementation of the bill.
Between 1916-1921 there was much violence and political upheaval, and in 1921 under the Government of Ireland act 6 of the 9 counties of Ulster formed Northern Ireland. The remaining 26 counties of Ireland form Sounthern Ireland.
Six counties of Northern Ireland are part of the UK. The rest of the island of Ireland is the Republic of Ireland and an independent country.
No. Kerry is in the Republic of Ireland which is not part of the UK. Only Northern Ireland is part of the UK and Kerry is not in Northern Ireland.
No, Northern Ireland is a part of the UK.
Ireland is not part of the United Kingdom. Part of the island of Ireland, known as Northern Ireland, is part of the United Kingdom, but the rest of Ireland, often referred to as the Republic of Ireland, is an independent country and is not part of the United Kingdom.
Northern Ireland is on the island of Ireland.
From 1801 until 1922, all of Ireland was part of the UK. In 1922 Ireland was partitioned, which for the first time created what is known as Northern Ireland. It has remained in the United Kingdom, while the rest of Ireland, now known as the Republic of Ireland, became independent.
The British pound, sterling. Unlike the rest of Ireland where euros are used, northern Ireland uses sterling as it is part of the UK.
There is no conflict between Northern Ireland and the UK. Northern Ireland is part of the UK. However, a minority of the population of Northern Ireland want to leave the UK and become a part of the Republic of Ireland. There has been a referendum about this in the past and the majority of the Northern Ireland people want to remain in the UK. Democracy won the day.
Northern Ireland is part of the UK so your UK visa is valid.
Only Northern Ireland is part of the United Kingdom. The rest of the island of Ireland, which you are referring to by the incorrect term Southern Ireland, is not part of the United Kingdom. The official name for that part of the island of Ireland is Éire or Ireland and it is also referred to as the Republic of Ireland. It is independent.
No. Northern Ireland is part of the UK, so the visa will cover it.
As Northern Ireland is still part of the UK; the same rules will apply.