As Runa pointed out, it isn't exactly only Holland.
The reason isn't that much connected to technological advance as it might look. It's more about geography (not that many places can be claimed to the sea) and socio-economic context (the inhabitants were a bit forced to do it, as they were a bit "stuck" there).
Generally speaking, human societies tend to choose the most efficient way (are "intelligently lazy", as a good friend used to say), they do not choose difficulties, unless there isn't a choice. It's the case of Low-countries.
Land reclamation can be done by digging ditches in the tidal flats so water easily runs off when it is low tide or you make a kind of fence that holds back mud so that the land rises.
Both methods help plants that can withstand the conditions to grow the former seabed. After that, you build so-called summer dikes, who cannot withstand the winter storms. In summer, sheep will grass the land.
Once sufficient land has been recovered, solid dikes will be built to protect land and buildings all year round.
In spite of that, it often happened earlier that the dikes collapsed and the sea flooded the land, therefore you can still see older farms lying on small artificial hills.
The oldest were so big that small villages were built on them.
The first examples is from Holland around 300 B.C. build by Frisian tribes.