Why did attitudes forward Mexican immigrant labor change from the 1920s to the 1930s?

In duncan v. louisiana, the supreme court ruled that the [blank](fourth, fifth, sixth) amendment could be incorporated to the states. the [blank](equal protection, due process, enforcement) clause of the fourteenth amendment allowed incorporation to take place in this case.

Afamous line of latitude is the north pole. true or false

What was a major failing of the united states under the articles of confederation?