Irrigation is what brings water to fields and crops.
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Nope sorry maybe if you put the questions :(
It was the "Oregon Train" that brought settlers to the Willamette Valley, sine although there were other smaller trails in the region, this was the most traveled by those wanting to start new lives and businesses in the region.
A. A person with a higher income pays more money in taxes.
A progressive tax's percentage is dependent on what income bracket you are in. So if you are in a higher income bracket (you earn more) then you would pay a bigger percentage than someone in a lower income bracket. That is why it is a "progressive tax", because it gets progressively bigger.