Did the (Army) National Guard take over/supplant the State Militias?

[JBeukema]

-and if so, does this not violate

To provide for organizing, arming, and disciplining the Militia, and for governing such Part of them as may be employed in the Service of the United States, reserving to the States respectively, the Appointment of the Officers, and the Authority of training the Militia according to the discipline prescribed by Congress;

(Constitution- Article 1 Section 8 POWERS OF CONGRESS)?

Is the (for example) Texas National Guard part of the Army National Guard, or are they separate? If they are separate bodies, do they answer to the State or to the Fed?