As mining activities in the Sierra waned in the early years of the 20th century, Puerto Vallarta and the agricultural valley to the north of the city became important destinations for those leaving the Sierra towns and looking for a place to settle. Many of those who arrived had family members already living in Puerto Vallarta, and the pattern of migration that ensued turned the town into a collection of more or less extended families, giving it the cohesion of a typical sierra town.