Each state has regiments of national guard that are under the control of the governor of that state. The president can "federalize" the national guard putting them under his control. To further add confusion some states have State Guards that are state controlled militias.

[–] YEP@hexbear.net 1 points 9 months ago* (last edited 9 months ago)

Sorry for late reply the little bell at the top didn't have a notification.

The federal government has gained almost complete control of the national guard over the centuries because they are masters of the purse. The most notable instance of the president federalizing troops to enforce a court order was in school integration. Eisenhower federalized the Arkansas national guard and mobilized the 101st airborne to enforce the integration of the little rock nine. He did so by executive order,

"SECTION 1. I hereby authorize and direct the Secretary of Defense to order into the active military service of the United States as he may deem appropriate to carry out the purposes of this Order, any or all of the units of the National Guard of the United States and of the Air National Guard of the United States within the State of Arkansas to serve in the active military service of the United States for an indefinite period and until relieved by appropriate orders. ".
https://en.m.wikisource.org/wiki/Executive_Order_10730

The us government also used these powers to send national guard units to Iraq and Afghanistan iirc