Today, the Federal government has expanded its role in domestic security despite that its has been a traditional responsibility of the State government.
The term "domestic security' describes the act of defending threats that are unconventional and directed towards the interior of a state.
Basically, the States are responsible for co-ordinating its internal/domestic securities, not the Federal government.
The Federal government is only maining responsible for co-ordinating the external securities.
But today, the Federal government has expanded its role in domestic security despite that its has been a traditional responsibility of the State government.
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