Much of Canada -- one of the two big possible breadbaskets you said you were eyeing -- is literally forest. The forest starts where the farmland stops.
Even if you cleared the forest, the soil is worthless. It's been covered in conifers for thousands of years. It's also goopy, as it is thawing. Or sandy. Or simply too acidic.
And while it might be good enough for grasses and cattle grazing one day, that day is not today, nor tomorrow, and in the meantime, you will be quite hungry.
In the medium term: good luck replacing California's food output with northern Alberta's.
Now, one might be able to hasten the soil improvement that with some sort of complex, time-consuming terraforming ('agriforming?') process, but good luck getting that process to scale in a hurry. Or on-budget. (Have fun even making a budget for that.)
Farming is actually just incredibly hard, the land is the biggest variable. It has to be just right. You can't just declare that an area is for food production like you'd rezone a city street for residential. Nature does not care about your lines on maps.
Don't believe me? Look at the last time we tried. The same reason that turning the Amazonian rainforest into farmland has not been an awesome thing.
And who is condescending to who, here? I'm not a farmer. But neither, I suspect, are you. So why do you discount my experience? I'm from the place you were talking about.
My suspicion is that you simply cannot tolerate the ego-dystonicity of ushering in an age of starvation for our children and grandchildren. But we did it. You did it, with help.
Check the prices at your supermarket.[1] Check the collapsing populations of insects, birds, and fish. Wait for the unravel to travel further up the food chain. Tag. You're it.
And yes, it's apocalyptic. It really, really is.
If you want to throw textbooks around, please read _This Changes Everything_. Then, read _Under a White Sky_.
You will find them both in the nonfiction section.
[1] Before you get typing: yes, inflation and supply-chain disruption can be symptoms of climate change -- specifically, when both are occasioned by a pandemic, which is the sort of event that becomes more common as habitats are squeezed up against one another. There will be more, faster now. I did PhD work on this, back in '05, in the aftermath of SARS-CoV-1. Like.