What reasons did people have for pushing into new frontiers?

During world war 2 mexican workers came to the united states as part of the

Initialy plantations everywhere growing cotton

Which of the following statements is true about water access in the middle east? a. access to coastal waters is not important to people.b. most countries depend on outside resources for water.c. water is available in large supplies in all countries.d. all countries have sources of renewable freshwater.