the economy and attract workers for the brewing and bleaching businesses (Haarlem was known for these, thanks to the clean water from the dunes), the Haarlem council decided to promote the pursuit of arts and history, showing tolerance for diversity among religious beliefs. This attracted a large influx of Flemish and French immigrants (Catholics and Hugenotsalike) who were fleeing the Spanish occupation of their own cities. Expansion plans soon replaced plans of rebuilding the destroyed city walls. Just like the rest of the country, the Golden Age in the United Provinces had started.
Linen and silk
The new citizens had a lot of expertise in linen and silk manufacture and trading, and the city's population grew from 18,000 in 1573 to around 40,000 in 1622. At one point, in 1621, over 50% of the population was Flemish-born. Haarlem's linen became notable and the city flourished. Today an impression of some of those original textile tradesmen can be had from the Book of Trades document created byJan Luyken and his son.
Infrastructure
In 1632 a tow canal between Haarlem and Amsterdam, the Haarlemmertrekvaart was opened, the first tow canal in the country. The empty areas in the city that were a result of the fire of 1576 were filled with new houses and buildings. Even outside the city wall buildings were constructed—in 1643 about 400 houses were counted outside the wall. Having buildings outside the city walls was not a desirable situation to the city administration. Not only because these buildings would be vulnerable in case of an attack on the city, but there was also less control over taxes and city regulations outside the walls. Therefore a major project was initiated in 1671: expanding the city northwards. Two new canals were dug, and a new defensive wall was constructed (the current Staten en Prinsenbolwerk). Two old city gates, the Janspoort and
