Prior to the adoption of the Constitution, the states were seen as sovereign entities that voluntarily entered into the union by adopting the constitution. The principle of state sovereignty, or states' rights, continued into the new government. States retain some sovereignty like separate nations would, but important functions are delegated to the federal government. The reserving of powers for the states allows for local solutions to problems and experimentation with new policies.
According to the 10th Amendment, all powers are reserved to the state that are not expressly given to the national level of government yet not denied to the states.
State constitutions.
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The states could pass and enforce laws and also regulate trade within the state.
The Constitution promotes a concept known as the 'Division of Powers' which essentially divides certain powers between the Commonwealth and state governments, and some powers are shared between them both. Those powers stated under section 51 are Commonwealth powers/matters, and those omitted are State matters. Answering the question... The Constitution forbids States from implementing legislation that is primarily Commonwealth (or Federal) responsibility.
Expressed powers
they are rserved powers
the state(:
resevred
The United States Constitution provided that states and the federal government would share certain powers. These powers are called Concurrent Powers. Examples of such powers are the power to tax and borrow money
powers that are not in the constitution do not exist any where else. (legaly)
It is good for the federal government to have special powers in order to uphold the constitution. If there was no central government, some state governments would treat citizens unfairly.