Harriet's family and friends had been involved in antislavery activities in Cincinnati, where there was fierce debate (and some violence) not only between pro- and antislavery activists but also among antislavery factions. At least one of Harriet's brothers was a radical abolitionist, while other Beechers, her father among them, were "colonizationists," favoring a "gradual" approach to freeing slaves, who would then be returned to African colonies. Harriet seems to have agreed, at least partly, with the latter view, but she became more radical at the beginning of the 1850s. In part, this may have been because of her child's death and her anxious attachment to the baby born a year later. The inhumanity of a system that separated parents from their children without recourse must have struck her as never before through this event in her personal life. At about the same time, Congress passed a Fugitive Slave Law, requiring that people who had escaped from slavery into the free states of the North be returned to captivity. This latest federal compromise with the slaveholding states of the South, along with Harriet's personal loss, seems to have energized her creatively, and when the editor of the antislavery periodical The National Era invited her to write something for his journal, she began to send him installments of Uncle Tom's Cabin.
The story, which turned out to be much longer than Harriet had expected, was published in book form in 1852 and immediately became a bestseller. As its popularity soared, it inspired songs, dramatizations, prints, and paintings. Harriet was soon threatened with a lawsuit by a Philadelphia clergyman whose defense of slavery she had quoted, accurately enough, in the book. The suit was never brought, but the uproar it caused in the press prompted Harriet, helped by family and friends, to collect damning evidence from court records, newspaper accounts, and other sources to support her published allegations about slavery. What she discovered was more horrifying than she had anticipated, refuting the claims of Southern critics that the fictional incidents in Uncle Tom's Cabin were based on invention or exaggeration. Harriet selected and published the results of her research in 1853, in the 259-page book A Key to Uncle Tom's Cabin.
