Spain and the US have very similar compulsory school hours and homework requirements. There's a good argument for rallying against this trend.
Homework has been around since… well, since schools first existed, and I remember doing a ton of it myself as a kid. I also remember refusing to do my homework, sitting on the back steps, watching geese fly over, wanting to be out bird-hunting with Dad, Mom in the kitchen, yelling “Get in the house and do your homework!”
For families with precious fewer hours each day to spend time as a family, homework can be a drag. A big one.
Before parents in Spain called for a "Homework Strike," The Spanish organization CEAPA (Confederación Española de Asociaciones de Padres y Madres del Alumnado) surveyed parents about homework, and 82% of those who responded believed that their children received too much of it; just over 50% of them believed it harmed family life.
If you consider the amount of compulsory hours students are required to be at school, the United States is right up there with Spain so it's likely there would be a similar frustration with homework in this country. And in fact, there is.