Shanghai Girls by Lisa See
Two sisters Pearl and May were brought up in Shanghai in the 1930's -- they are well off and live a modern, carefree life. When their father gambles away all the family's money, however, the girls are suddenly forced into marriage to two Chinese boys from L.A. to pay off their father's debts. When the Japanese attack, the girls are forced to make their way alone to America and start a new life with their husbands.
Although this is a fascinating historical novel about Chinese immigrants in the mid-1900's, it's also a timeless tale of sisterhood -- the jealousy and the love. I enjoyed this.