Have these territories expressed that they want statehood?
Reiterating this again. It was my understanding that at least some of these territories have been pushing for more INDEPENDENCE from the United States IRL. Has it been shown to be different in-game? Right out of the gate, I would be hesitant to get on board with this without vocalized support from each territory that statehood is what they want. This change would also require a constitutional amendment.
Much of the movement towards greater autonomy stems from a lack of action from Atlasia regarding concerns of the residents in these territories.
In Guam, for example, the Chamorro people had vast tracts of their property confiscated during the Second World War. They were only offered meager compensation in the 1980's. Many requests for compensation were also denied due to the lack of written documentation of land ownership.
These territories would benefit from actual representation in the Congress and their people deserve to be American citizens at the very least. This legislation accomplishes just that.