A genera increase in prices
The great reform act enabled many parts of the land to prosper and the problem of rotten boroughs to cease to exist by redistributing the seats of parliament according to the needs of the land. What this means is that places that were "rotten" were now better represented and people could fight for their development in the parliament.
The above answer is wrong. Potatoes come from the New World. The correct answer would have to be peaches - all others are indigenous to North America.