To protect government officials.
Rivers, mountain ranges, historical points (railway, a wall, etc.)
Most country borders are divided by geographical points, and sometime just for political and historical reasons (what belonged, and waht should belong to whom).
Hope it helped,
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All the time, one full doing is 24 hours
Answer: of declining tax revenues.
Explanation: Government agencies had no money to pay their workers so they started printing money. This was due to a decline of tax revenue in Zimbabwe in the 1990s. The major cause of these was asa result of inexperienced farmers causing a shortage of food supply which led to hyperinflation.