Answer:
Their tradition and religious tolerance.
Step-by-step explanation:
Many of the European empires forced the people that they colonized to adopt a certain religion and European culture. Spanish empire is a great example for this. They forced each of their colonial territory to be a Catholic and speak Spanish Language on day to day basis.
The Dutch colonies on the other hand, did not intervene with such things.
Even though they still force the colony to do things for their economic interest, they let the people adopt whatever religion they want and keep their local tradition alive.