Taoiseach Enda Kenny is now on his way back to Ireland today after a five-day visit to the US.
Last night, he gave US President Barack Obama a "certificate of Irish heritage" in the White House.
"This will have a special place of honour - alongside my birth certificate," quipped President Obama.
The US President told assembled guests that America sees Ireland as a friend every day of the year.
He repeated that Ireland's best days lay ahead and that as long as he is President Ireland will have a steadfast ally and friend in the US.
The Taoiseach praised the courage and resilience of the Irish people for the difficult economic times of recent years.
Mr Kenny thanked America for the support and the belief that we could succeed.
“We have swapped the confines of the old fears for your audacity of hope,” he said.
President Obama also pronounced that both he and the Irish economy will be coming back.
“I want to thank the Taoiseach, his lovely wife, and all of the people of Ireland for the extraordinary hospitality they showed Michelle and I when we had the chance to travel there recently,” he said in the Oval Office.
“It was a magical day. It was too short, so I provided assurances that we will be returning.”