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While there's a big status thing on the forged vs. cast war, nothing on a 1911 frame is loaded to where it makes any difference.
Original Colts were forged because forging was the "near net" manufacturing mode of the day, and the frames were finished off on lines of single-operation machines, also the mode of the day.
Casting, back then, tended to be iffy as far as the final product's strength, and was mostly a feature of the cheapest guns.
Casting technology (mostly the temperature control and heat treating part) improved, and by the 1960s Ruger was casting almost every metal part of their rifles. Nowadays they not only still do, but their Pine Tree facility makes castings for several other gunmakers as well, along with a host of industry customers.
The only parts of a 1911 frame I've ever seen break are the dust cover and the bit of upper frame rail over the slide release cutout. Those generally require high round counts, and they're just as common on forged frames as cast ones, best as I can tell. For sure, they go back to when all 1911 frames were forged.
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