whats this movie? about 3 Asian girls, war and immigrating to the USA?

hello! when i was young, (young enough to not remember a name, that is) i saw a movie about 3 young women, so have immigrated to the USA with their moms, after a war on their country, the movie is a collection of flashbacks of the mothers' suffering, and how the girls live, it ends with someone discovering they had a twin, and the twin comes to visit her in the states,

whats the name?

thanks in advance!! xx :)