1) Poverty - poor people can't buy food and can't buy seeds to plant to grow food; hungry people become too weak to work.
2) War - war causes people to flee their homes and land; soldiers take or destroy food; crops get destroyed, fields get mined, and wells become contaminated.
3) Natural Disasters - earthquakes, floods, and droughts destroy or prevent agricultural production and dislocate people; epidemics of disease have similar effects and also cause weakness, poverty, and hunger.
4) Bad Governments - governments put resources into developing cities, building militaries, etc., rather than spending money to encourage farming, build roads, etc.
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