What level of government has primary responsibility for defining marriages and other civil contracts?

It is state level governments that have the primary policy making responsibility and ability to define marriage and other such civil contracts. As such, marriage law can differ between states, such as whether property and assets are shared by the couple or remain separate.

Ifeel like this means that we shouldn't just live for ourselves.also, we should respect others as well as people around us. it reveals that everyone should have equalized freedom, no matter their differences: races, cultures, skin color, etc,. we all deserve the same privileges.