Many of the streets and squares were laid out by John Wood, the Elder, and in the 18th century the city became fashionable and the population grew. Jane Austen lived in Bath in the early 19th century. Further building was undertaken in the 19th century and following the Bath Blitz in World War II. Bath became part of the county of Avon in 1974, and, following Avon's abolition in 1996, has been the principal centre of Bath and North East Somerset.