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Sufficient labor force.
Marketable population.
Innovation and technology.
Transportation, communications, and logistics.
Capital and investments.
Natural Resources.
Because Japan lacked sufficient raw materials and had a high population density, it desired additional land for agriculture, and Natural Resources. :]
Because we don't have enough land and other natural resources to be self-sufficient in the UK.
Preventative care - try to eat well, drink sufficient water, and use natural healing.
IT IS TOO ARID. Natural plants need sufficient rainfall or fresh groundwater to grow and the Persian Gulf region is noted for lacking both of these.