What historical facts are evidenced in Mori's Shizuko's Daughter?

One historical event evidenced in Shizuko's
Daughter is the movement for the liberation of women from traditional
Japanese roles that confined women to the place of wife and mother and, especially for
the most traditional, to clothing that confined women equally narrowly as social roles
did. During the United Nations Decade for Women, which spanned 1975 to 1985, laws change
in Japan that gave at least nomial rights to Japanese women. This theoretical liberation
is evidenced in the social violations Yuki repeatedly either accidentally or willfully
commits. One example is continuing to wear colorful clothing--designed and made by her
mother--following her mother's unfortunate and tramatizing death. When told to wear
something of a more suitable color and gravity, Yuki goes to her closet to breathe in
the scent of the colors to "drown out the wailing chant [of mourning] with their
brilliance."

Another example that evidences the historical
event of the liberation of Japanese women--confirmed by Japan's new laws in the
1970s--is when Hanae gathers Yuki's clothes up to take the socially unsuitable garments
away from Yuki. Yuki violates cultural mores and social by yelling at Hanae and
expressing her true feelings: "You pretend that we're all happy together. I don't
pretend. I hate you." A third example is her intentional smashing of the communal sake
bowl as an overt sign of protest at her father's marriage to his second wife, Yuki's new
(unwanted) step-mother. She also carries a picture of her father and mother on their
wedding day as a sign of her right to express herself regarding her father's
marriage.