Never, it only became part of the UK. Britain and Ireland are two completely separate islands.
If you mean the UK then, as part of the Act of Union in 1801. If you meant just Northern Ireland, then in 1922 when Northern Ireland was created and what is now known as the Republic of Ireland came into existence. It is not part of the United Kingdom.
The island of Ireland has always been a part of the British Isles, which is a geographic term, not a political one.
Somewhere around 1169 with a partial invasion by Normans. English rule was established by the mid-13th Century.
In 1922 Ireland became independent, with Northern Ireland remaining part of the UK.
In 1801, Ireland became part of the United Kingdom. In 1922 the Republic of Ireland and Northern Ireland were created and Northern Ireland remained part of the United Kingdom while the Republic of Ireland became independent.
Ireland was gradually conquered by the English from about 1170 onwards.
The United Kingdom formally came into being in 1801. Ireland became independent of it in 1922.
When the Act of Union came into force, on the 1st of January 1801.
Scotland, Ireland Wales.
In reality, Bermuda did not actually choose to join the British Empire. They islands were forced to join or be conquered.
Ireland was still a part of Britain at the time ... On 5 August 1914 Britain declared war on Germany on behalf of the entire British Empire.
The U S A never joined the British Empire.
It didn't the US was formed when it revolted against the British Empire
1894
1878
Irish navvies
Eire, or the The Republic of Ireland, had their independence from the British Empire ratified in January 1922 followed by Egypt in February 1922.
Canada didnt join it was fought over by the French and British in which the Brits ended up winning therefore becoming part of her empire.
This is because the majory of people living in it known as unionist want to remain part of the UK. At one stage the whole island of Ireland was part of the Great Britain because the king at the time took control. As time went by only the nothern end of this island wanted to remain part of Great Britain called Ulster.
1964