How did business from 184 to 1900?

Initial colonization of North America was extremely difficult and most settlers before 1625 died in their first year. Settlers had to depend on what they could hunt and gather, what they brought with them, and uncertain shipments of food, tools, and supplies until they could build shelters and forts, clear land, and grow enough food, as well as build gristmills, sawmills, ironworks, and blacksmith shops to be self-supporting. They also had to defend themselves against raids from hostile Indians. After 1629 population growth was very rapid due to high birth rates (8 children per family versus 4 in Europe) and lower death rates than in Europe, in addition to immigration.[3] The long life expectancy of the colonists was due to the abundant supplies of food and firewood and the low population density that limited the spread of infectious diseases. The death rate from diseases, especially malaria, was higher in the warm, humid southern colonies than in cold New England.

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c or d both can be the answer