California, Arizona, Nevada, and New Mexico
The option that does not explain why a large part of the Great Plains became known as the "Dust Bowl" would be that "<span>The soil of the Great Plains was too rocky to support farming," since the soil was (usually) relatively fertile. </span>
Native Americans were hunter-gatherers, so they saw land as hunting territory, where Europeans saw it as farmland and land to settle on. The native Americans would move around the land to hunt the animals and thus didn't claim land, but the colonist saw it as their land, so it was more important for them.
Any ‘European’ country who fulfils the EU criteria of membership can apply to join the EU. Membership criteria are known as the Copenhagen criteria. These include ‘a free-market economy, a stable democracy and the rule of law, and the acceptance of all EU legislation.