The US House of Representatives has passed a bill that doubles funding for the International Fund for Ireland to $1.5m from $750,000.
The International Fund for Ireland is an independent organisation that supports economic regeneration and social development projects in areas most affected by the decades of violence in Northern Ireland.
The increased funding was proposed by Democratic Congressman Brendan Boyle, who said the work of the International Fund for Ireland had become increasingly important.
"Brexit will have significant consequences for the island of Ireland,"Congressman Boyle said.
"The border is in danger of, once again, becoming a significant barrier, physically and psychologically, to harmonious relationships that have been delicately fostered over the past few decades."
The bill increasing funding for the International Fund for Ireland will now be considered by the US Senate.