The Dutch have been spending centuries on their land reclamation systems for most of their country. Half of their area is less than 3 feet above sea level. They have about 13,000 square miles to work with, both above and below.
Louisiana has over 51,000 square miles to work with and most of it is not below sea level.
There is no shortage of elevated land in the US.
There is no shortage of elevated land in the EU - for example, France is only 25% as densely populated as the Netherlands.
Dutch citizens can move almost anywhere in Europe they want to, and never have to deal with land below sea level again.
Why don't they just abandon Zeeland before there is a repeat of the great flood of '53?