The port of Rotterdam became bigger and bigger in the 19th century when several new canals were dug. These were: "Nieuwe Waterweg" (lit: New Waterway), and "Voornse Kanaal". The city grew quickly due the enormous amount of work in the port. Population grew from 160,000 people in 1880 to 315,000 in 1900. Various new districts were built, including "Cool", "Crooswerk", and "Nieuwe Westen". Neighbouring places also became part of Rotterdam. In 1920, the city held more than 500,000 people for the first time in its history