There is no law, however there is the general tenet in education the classroom time is intended for instruction and demonstration, and practice (homework) should be done outside of class.
Keep in mind that as much "homework" as your teachers give you, they are giving themselves too, multiplied by the number of students they have. Homework must be graded, and they're not doing that during class.
There is on rule but child will learn by doing their homework and their parents will also understand the problem or mistake by which their child child can improve their study
Yes, they do
None. No schools or states have banned homework. Some schools have reduced the amount given but it is still given out.
Anywhere you find schools is going to have homework.
There are no studies on the subject, but many schools do have it.
I do not know whether homework is legal by US law, however if you take UK laws literally homework is not legal, this is because schools in the UK are legally not allowed to interfere with your lives outside of school. (With the exception of the well being of children. E.g. being harmed by adults) It is also illegal as any work done outside of school MUST be payed for by law. (This is a law to prevent Legal Slavedom)
100%
yes
In Mexico and Spain they do get homework, but it about the same as the United States.
yes I have been to many places in the world and all had homework
Most schools give homework -- that way, the kids can all go home earlier instead of staying at school until everybody finishes all the work.
No studies have been done on this, but most schools do give out homework.