Question

why do have the catholics and protestsnts have conflicts in northern ireland​

Answer 1

The conflict began during a campaign by the Northern Ireland Civil Rights Association to end discrimination against the Catholic/nationalist minority by the Protestant/unionist government of Northern Ireland and Royal Ulster Constabulary (RUC). The security forces of the Republic of Ireland played a smaller role.

Answer 2

Answer:

The conflict began during a campaign by the Northern Ireland Civil Rights Association to end discrimination against the Catholic/nationalist minority by the Protestant/unionist government of Northern Ireland and Royal Ulster Constabulary (RUC). ... The security forces of the Republic of Ireland played a smaller role.