What has largely replaced organized state militias?

Federal law allows states to form militias. These are reserve organizations under the authority of state governments and regulated by the National Guard Bureau. There are two basic kinds of militias — State Defense Forces (also known as State Guards, State Military Reserves or State Militias) and Naval Militias.

The Volunteer Militia grew more and more active through the 1880's, forming into State regiments with State funding. Most States continued to organize their Militia along the lines of their own Militia Acts, no revision having been made to the National Act since 1862.

Explanation:

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