List reasons why citizens may not be able to vote

They could be living in a monarchy where their opinions don't matter
or they could be living in a dictatorship

but if we're talking about America or Canada
they may have a criminal record
they may be too young
they may have not registered
they may not be a citizen
etc

To solve their problems, mesopotamians used irrigation, a way of supplying water to an area of land. to irrigate their land, they dug out large storafe basins to hold water supplies these ditches brought water to the feilds. to protect their feilds from flooding, farmers built up the banks of the tigris and euphrates.hope ths !