Short answer: No.
Longer answer: Although lots of houses there have sloping roofs, Holland is not 'the' country. Lots of houses have flat roofs too. In countries with lots of snow each winter, houses tend to have more sloping roofs; almost all have in the alps (Austria, Switzerland).
All countries in Europe have sloping roofs on at least some of their houses
houses in hills have sloping roofs so that the rain-water and snow may drain off easily.
Because they are there home made roofs and they are kind of poor people in life so that is why they have sloping roofs
Anywhere there is a lot of snow fall. A flat roof will cave in under the weight of significant snowfall.
Sloping roofs are self-draining from rain and snow, and less likely to leak.
windmills
The houses in the terai regions and in Goa and Mangalore have sloping roofs because there is very heavy rainfall. If there is no slanting roof, the water of the rain will collect there which weaken the strength of roofs.
Assam has very heavy rainfall every year. To avoid accumulation of water on the roof tops, houses have sloping roofs
sloping roof houses to make sure that the snow falls down.
There is no big deal of houses of tamilnadu,they are usually built with cement and bricks. They can be flat roofed or have a sloping roof as there is a lot of rainfall there.
Most houses have sloping roofs including Ranch, Colonial, cottage, saltbox...
Swiss Chalets have sloping roofs to get rid of the snow.