You've shown that link before, but when I read it all I see is another iron producing region in the US that has the convenience to be ready to ship to processing by water. I see no claims that it was the primary provider, a majority provider, or even the largest of minority sources of iron. I see no claims in the notoriously whimsical wiki that it was even responsible for industrialization. Where's the claim that it was more than all the other iron-producing regions of the US? Where's the claim that is somehow easier to mine, rather than easier to ship? Wiki sure isn't making them.Not that significant or easy to mine. It was this that drove US industrialisation.
And really, I'm going to require facts to believe some person's claim that a single source was mandatory for the industrialization for a entire country as widespread as the US. Why would the other sources have been developed if one already supplied all the needs? What would change in the economic formula that states you don't start something unless there's a market, which must have been the case if there are major iron mines developed across the country and even in the same region?
I'd be interested as to what makes you think one single source (not even entirely removed by the border change) was responsible for a nation-wide phenomenom, but it's going to take far more than a single source. Data on how much of the Iron Range's metal supplied compared to the rest of the country's output would be a start. How much it sent to the North (as opposed to how much the South sent) would also be good, but how about outside of the Lakes region? New England? The Middle cost? The south, where iron from the North was actually cheaper only because of the train tricks robber barons pulled?
Besides, moving iron north of the border doesn't mean it doesn't exist. If it really was so massive and critical as you say, there would be far too much of it to be taken solely by Canada, and then the main barrier between it being sold straight to the US is the tariff barrier, which is in itself a very negotiable thing.
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