How did carolina gold become the biggest cash crop in the colony?

In colonial America, slaves from west Africa made many a plantation owner rich by growing a particular high-quality variety of rice. Now, genetic research suggests the slaves not only supplied the labor and the agricultural skills they'd gained in their home countries but also may have brought the valuable crop with them.

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the steam engine.

the locomotive.

the telephone.

the telegraph.

the internal combustion engine.

the rifle.

ironclad ships.

electricity/light bulb.