Remember the US is a single news market. We have ~215 million eligible voters. In a few places in a few cities, there are long lines. So the whole country, and you in the Netherlands, get to see video of that.
As an example, my county has ~500,000 residents & ~150 polling locations on Election Day. Each can handle about 20 voters at a time, so they have a throughput of ~2/minute. For early voting, there is/was a single polling place for all 500,000 of us, and it has a thoughput of about 4 per minute.
A big issue in the urban/suburban part of US (ie about 90% of voters, but only 10% of the land area) is that people do not live near where they work. So even though the polling places are open from generally 6am to generally 9pm = 15 hours, a large fraction of voters must vote in either the first hour or the last 2, or else miss part of their work day. Missing part of the work day is not doable for sizeable fraction of the populace.
Using me as an example, if I was to try to vote mid-day on election day I’d have to be away from work for about two hours even if the actual vote process only took 10 minutes.
The same time-of-day issues obtain for early voting. I did mine last week but I had the freedom to show up at 9am, after the vast majority of people were already at work. It was just me & a bunch of retired people. I was in and out in 10 minutes. The poll workers told me the line was an hour long at 7:30am.
And that’s the real issue. For a big fraction (WAG 60%) of voters, there is only a very brief window to vote early in the day or late after work. As silly as it is to try to vote a whole country in one day, what we’re really tying to do is vote an entire country in one hour before work. And naturally, in those parts of the country which are budget contrained, we just don’t have the logistical wherewithal to take in that many voters that fast.