The introduction of started with the capture and sale of Indians.

The introduction of the slave culture began with the capture and sale of Indians.

Explanation:

The introduction of the slavery culture in the American colonies was made with the sale and capture of indigenous people, mainly in South America, in the territory dominated by the Portuguese, however, we also have records of attempts to enslave indigenous people in North America. This happened before American enslavement and followed the same principle of capture and purchase. The indigenous tribes kept some slaves, who were conquered during periods of war between tribes. Once captured, they were sold to the colonists as slaves.

This practice was abandoned due to pressure from the Catholic Church that saw the Indians as human beings who could be converted and for the great profits that the slave trade provided. Thus slavery stopped being done with Indians and started to be done with Africans.

i would think it's industries and hydroelectric power

the use of email to replace slower surface mail.