The Republic of Ireland has voted overwhelmingly to overturn the abortion ban by 66.4% to 33.6%.
A referendum held on Friday resulted in a landslide win for the repeal side.
Currently, abortion is only allowed when a woman’s life is at risk, but not in cases of rape, incest or fatal foetal abnormality.
The Eighth Amendment, which grants an equal right to life to the mother and unborn, will be replaced.
The declaration was made at Dublin Castle at 18:13 local time.
The only constituency to vote against repealing the Eighth amendment was Donegal, with 51.9% voting against the change.
A vote in favour of repeal paves the way for the Dáil (Irish Parliament) to legislate for change which would see the introduction of a much more liberal regime.
In 2015 the country voted overwhelmingly to legalise same-sex marriage in a historic referendum.
Ireland’s time of reckoning
The people travelling #HomeToVote
Timeline: Ireland and abortion
‘Burden of shame is gone’
Reacting to the result, the taoiseach (prime minister) Leo Varadkar, who campaigned in favour of liberalisation, said it was “a historic day for Ireland,” and that a “quiet revolution” had taken place.
Mr Varadkar told crowds at Dublin Castle the result showed the Irish public “trust and respect women to make their own decision and choices.”
He added: “It’s also a day when we say no more. No more to doctors telling their patients there’s nothing can be done for them in their own country, no more lonely journeys across the Irish Sea, no more stigma as the veil of secrecy is lifted and no more isolation as the burden of shame is gone.”