Of the following, which is the most significant factor in causing strained border relations between mexico and the united states?

mexico is the largest foreign supplier of marijuana and methamphetamine to the us market

abundant rainfall in recent years along much of the mexico-us border region has ameliorated periodically strained water-sharing relationships

mexico must deal with thousands of impoverished guatemalans and other central americans who cross the border looking for work

the us has intensified security measures to monitor and control legal and illegal transport of people and goods

Which of the following selections is least useful for supporting the claim that states intentionally built unequal school systems? question 1 options: the supreme court ruling in plessy v. ferguson (1896) wrote into law that america had two separate societies: one black and one white. it was very clear by the mid-1900s that southern states had expertly built separate educational systems. these schools, however, were never equal. states with laws keeping schools segregated never gave equal amounts of money to their black and white schools. ten years after brown, fewer than 10 percent of southern public schools had integrated. some areas did not comply at all.