Map at multiMap
Northern Ireland is often referred to as 'Ulster', despite including only six of the nine counties in the original province of Ulster.

The Ulster Scots or Scotch-Irish:
Scots, mainly Gaelic-speaking, had been settling in Ulster since the 15th century, but large numbers of Scots-speaking Lowlanders, some 200,000, arrived during the 17th century following the 1610 Plantation. The Plantation of Ulster refers to the confiscation of half a million acres from Irish chieftains by wealthy landowners and King James I of England and VI of Scotland.
See:
The Plantation of Ireland 1610 - 1630 at TheReformation.info
Plantations of Ireland - Wikipedia

Northern Ireland has a population of approximately 1.65 million, 900,000 Ulster-Scots Protestants and 750,000 Irish Catholics.

In the McBride Genealogy, Deanna Taylor says: "The Sept was located in County Donegal in the North West of the country. Some descendants may be of Scottish origin, the name having been brought into Ulster (N. Ireland) by Scottish settlers in the seventeenth century."
However, the 1500 map shows Clan MacBride in Co. Antrim in the North East.