Her periodical, The Guardian of Education, helped to define the emerging genre by seriously reviewing children's literature for the first time; it also provided the first history of children's literature, establishing a canon of the early landmarks of the genre that scholars still use today.
Trimmer's most popular children's book, Fabulous Histories, inspired numerous children's animal stories and remained in print for over a century.
Trimmer was also an active philanthropist.
She founded several Sunday schools and charity schools in her parish.
To further these educational projects, she wrote textbooks and manuals for women interested in starting their own schools.
Trimmer's efforts inspired other women, such as Hannah More, to establish Sunday school programs and to write for children and the poor.
Trimmer's works are dedicated to maintaining many aspects of the social and political status quo.
As a high church Anglican, she was intent on promoting the established Church of England and on teaching young children and the poor the doctrines of Christianity.
Her writings outlined the benefits of social hierarchy, arguing that each class should remain in its God-given position.
Yet, while supporting many of the traditional political and social ideologies of her time, Trimmer questioned others, such as those surrounding gender and the family.
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