Founded in 1999, the alliance ceased to exist in 2010 when its remaining members joined the Sri Lanka Freedom Party.

The National Unity Alliance's was re-activated by Azath S. Salley by a Fundamental Rights petition with the Supreme Court of Sri Lanka.

[1][2] Sri Lanka Muslim Congress (SLMC) leader M. H. M. Ashraff started discussions on forming a new political alliance in 1998.

[3][4] Two political parties were members of the NUA - the SLMC and the Sri Lanka Progressive Front.

[9][10] The SLMC also secured seven seats under the PA. During the 2000 election campaign Ashraff was killed in a mysterious helicopter crash on 16 September 2000.