By this time wealthy Jewish families were growing in number.

This upward mobility and increasing economic and political power no doubt made the British upper classes envious and resentful, fuelling anti-semitism.
Trollope chose to have _Nina_ published anonymously in _Blackwood's Magazine_ for reasons which he described in his autobiography: From the commencement of my success as a writer.

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I had always felt an injustice in literary affairs which had never afflicted me or even suggested itself to me while I was unsuccessful.