I'm not from the US and hadn't heard of this. But are we arguing it WAS socialism?
https://en.wikipedia.org/wiki/Homestead_Acts
From my very cursory reading of the above, seems like imperialism handing out indigenous land to settlers, no?
In conclusion, I'm saying this definitely does not look like socialism to me. Socialism is democratic control over society by the workers, and the Homestead Acts (from my cursoru understanding) don't seem to be that. Just maybe the tiniest bit better than having massive slave operated holdings by oligarchs.