Black olives are available in jars in the US as well. They are just a specialty item similar to higher end jarred green olives. Black olives in a can and green

Black olives are available in jars in the US as well. They are just a specialty item similar to higher end jarred green olives. Black olives in a can and green olives in a jar are also available in commodity style qualities. So this is better labeled as "why are commodity black olives in a can while commodity green olives are in a jar".