Because people require the state to recognise the institution of marriage. For this to happen the state (ie other people) has to come to a common agreement about what marriage is.
Another Perspective
States make laws that affect marriage because marriage is a legal arrangement under civil law. In the United States religious clergy along with an array of other major and minor officials are permitted to perform the marriage ceremony ifthe couple has obtained a civil marriage license. In some states such as California, any person can obtain a one-day permit to perform a marriage ceremony, for example, the father of the bride. Simply by being legally married, two people acquire hundreds of legal rights both under state and federal law.
The states have the power to make laws regarding marriage and family issues. The states also have the right to govern land transactions.
Delagated Power
The United States Constitution allocates the power to make laws to the Legislative branch.
Congress can't make laws about marriage and can't make any laws that take away your rights.
The power comes from section 51 of the Australian Constitution, which explicitly gives the commonwealth the power to legislate in that area.
Laws that directly regulate abortion, drinking ages, marriage and divorce, and sexual behavior are policy prerogatives that belong to the state government.
yes
Did congress have the power to manage foreign affairs
Article 1, section 1 of the United States constitution states who has the power to make laws. In the United States, laws are made in the legislative branch of government.
Legislative has the power to make laws.
The power of making laws and then enforcing them is called jurisdiction.
This could lead to an upset with the states towards the government. This may also lead to more wars within the states.