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In the 1870s, the Russian government revoked the exemption from conscription of a group of Volga German Mennonites.
Given the Mennonites' militant pacifism, they didn't like this, so they came to America where they could practice their religion and way of life in peace. They brought with them a special grain strain called "turkey red" that could grow in the winter.
So what if "turkey red" never came to the United States? Say the Czars left them alone or the Czarist regime managed to destroy their community through conscription/assimilation measures and "turkey red" got lost?
Methinks the US and the world would be a much poorer, unhappier place with reduced wheat harvests in the US. I get the impression that in Russia, "turkey red" was not something particularly widespread, so if the Mennonites stayed, it would have been a local thing and not the uber-crop it became in the US.