lots of things
there are 6 state parliaments and 2 territory parliaments in australia.
In the US, the federal agency responsible for enforcing import and export laws is the U.S. Customs and Border Protection (CBP).
writing and amending Federal Laws in the US
For passing the laws: The US Congress For enforcing and prosecuting the laws: The US Justice Department.
writing and amending Federal Laws in the US
Laws are rules and regulations that are developed by either ther the state parlaiments or in the case of federal law by the federal parlaiment. Parliaments are presured by the electorate to develop laws that they feel are needed this principle aplys to both state and federal laws.These laws however are made in a constitutional framework that defines what the law can controll and what it can not and how.
making treaties,enforcing laws and making laws
IRS
That would be the Judiciary (The Courts) at both a state and federal level.
Department of Justice- Attorney General
The president is responsible for enforcing all federal laws. The Department of Justice and the Treasury Department are his responsibility and include agencies devoted to law enforcement, such as the FBI and the Secret Service. Some more specific area of law enforcement are in drug violations, counterfeiting money and restrictions on radio and television broadcasting.
The executive branch is responsible for putting laws into force. The legislature enacts the laws for the executive. The executive also enforces the will and judgments of the courts. In federal government cabinet agencies under the president enforce laws and regulations.