[deaddodo]

I gave the short version. Your outline of consequence and effect is correct.

The British demanded specific oats and other crops, which required large allotments; this left the Irish farmers with a small portion of land to grow their own subsistence on, in turn leading to Potatoes as the only option (ending in a monoculture). When the potatoes started dying, the Irish had no access to the other crops (as they were grown for the tenant holders).