The main source of revenue was tariffs.
the main sources of income for china are agriculture,industry and trade and services(courtsey :wikipedia)hkjhljhl
An example would be Head Start or the Food Stamp program.
Indentured servants were the first source, but slaves soon replaced them. The first slave arrived in 1619.
The main constitutional arguements during the debate over slavery were representation in Congress, importation of slaves, and the Bill of Rights.
hunting and gathering
after the ice age was over early people either fished,gathered,or hunted for more simple animals
During the Paleolithic age, people were primarily hunter-gatherers. They hunted animals for food, made tools from stone, bone, and wood, and gathered plants and fruits for their sustenance. The main focus of their occupation was on survival and securing resources for their communities.
Bread
polar bears main source of food is fish, seabirds and sometimes reindeer
Camels Feed On Desert Food Like: .Cactus .Grass .Desert Plants
The Cheyenne's main food source is buffalo berry's.
Steam was the main source of energy during the industrial revolution.
Corn or maize was a primary food source.
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the main source of income in Ontario is clothes and food :P:P:P
main source for food and water