What caused the structure of the family to change? In the 1930s and 1940s, many families faced serious financial, or money problems during the Great Depression and women were choosing to go to college and take jobs outside the home. As a result, the birthrate began to fall and the divorce rate began to rise. During World War II (1939-1945)，5 million women were left alone to take care of their homes and their children. Because many men were at war, thousands of these "war widows" had to go to work outside their home.

　　During the next ten years, the situation changed. There were fewer divorces, and people married at a younger age and had more children than the previous generation. It was unusual for a mother to work outside the home during the years when her children were growing up. Families began leaving cities and moving into single-family homes in the suburbs. The traditional family seemed to be returning.

　　In the years between 1960s and 1990s, there were many important changes in the structure of the family. From

　　the 1960s to the early 1970s, the divorce rate doubled and the birthrate fell by half. The number of single-parent families tripled, and the number of couples living together without being married doubled again. In fact, the single-parent household, once unusual, has replaced the "traditional" family as the typical family in the States. If

　　we can judge from history, however, this will probably change again in the twenty-first century. The Changes of the American Family

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