Government ID is mandatory in the Netherlands so almost everyone already has one. They’re also relatively cheap and easy to obtain. The US has no official government ID, so you would need to use a passport or driver’s license. Most Americans don’t leave the country and don’t have a passport so that would mean you would have to have an up to date driver’s license. That’s not cheap and the DMV is hell on earth so a lot of people don’t bother. Requiring ID to vote therefore disproportionately targets low income groups. In the end, the US doesn’t really have a voter fraud problem so there’s no need to require ID.