What were three problems faced by settlers on the great plains?

Perhaps the most important of these was the fact that the Great Plains were simply not that easy to farm using the technology that was then available.  Rain was not very consistent.  There were things like locust swarms.  Even the ground was hard to plow because of how thick the roots of the prairie grasses were.  

A second set of problems was connected to the fact that the Great Plains were far from the populated areas.  There was very little wood on the Great Plains and it was hard to get any from the East.  This meant people had to do things like living in sod houses.  They had to do without much fuel and without many kinds of foods that were available in the East.

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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the three roles stated in the dialogue develop the siblings' personalities.

lloyd's personality looks like a trademarketer

dana's personality is afraid from lloyd's behavior and the oldest sister is a decided person who tries to solve any conflict