The UNP was founded on 6 September 1946 by amalgamating three right-leaning pro-dominion parties from the majority Sinhalese community and minority Tamil and Muslim communities.
统一国民党成立于1946年9月6日，由三种来自多数僧伽罗人社区和少数泰米尔人和穆斯林社区的右派政党合并组成。