Law of the land

What is the reason why the law of the land is law ?

Rashbam explains that it is based on the fact that all those who live in a country accept upon themselves willingly to abide by the laws of that government.

Siman - this is on Daf 54b. When we reverse nun daled , we get din.
Now may be a good time for a gem of Torah study.
www.GemsofTorah.com