What is the wide, fairly flat land bordering the mississippi river called?

If there are laws or rules in a society and they are in conflict, how do we decide which takes precedence?

The country in the world with the largest population is_?

Triangle xyz is translated 4 units up and 3 units left to yield triangle x'y'z' what is the distance between any two corresponding points on triangle xyz and trianglex'y'z' ?