He sent thousands of troops to disputed territory to create conflict
Here is a Answer to your question:
Why does water cause conflict?
Water conflicts occur because the demand for water resources and potable water can exceed supply, or because control over access and allocation of water may be disputed, or because water management institutions are weak or missing.
What is conflict in food?
Conflict often involves competition over control of the factors of food production, primarily land and water. Having more people to feed, more pressure on land and water, more variable climates, and greater price volatility tends to increase stress; it also raises the risk of civil unrest or worse conflict.
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Answered this earlier: They were getting kicked out of their native lands, died from unfamiliar European diseases (like smallpox and measles), mistreatment and wars. <span>
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National Interfaith Coalition, hope this helps!!