Not all industries prospered in the Boom in the 1920s of America.
Old industries such as Coal and Cotton did terribly in the Boom as people became interested in the new products such as clothes made from artificial material(polyester). Coal was an old source of power, in the 1920s oil and electricity became greatly used.
Agriculture was also poor many farmers left the farmland to find work in the city. As new people emerged, new demands also appeared. Instead of fresh fruits and vegetables, Americans preferred cereals and bread which lead to the decrease of demands in fruits.
In the 1920s, Argentina and Canada began to supply the world crops which lead to the drops of demands from USA directly. Later in the year Prohibition(anything related to alcoholic drinks was made illegal) was introduced which caused an instant drop to the demands of barley(barley was used for making alcoholic drinks such as beer)
The principal reform called for, is the elimination of the national origins quota system and the overview of numeric limits on immigration from the western hemisphere laterally with the strong claim for immigrant workers by the US employers led to rising numbers of unauthorized immigrants in the united states in the decades after 1965 especially in the southwest. Policies in the immigration and control act 1986 that were intended to curtail migration across the mexican united states border ran many unofficial workers to settle lastingly in the united states. The demographic trends developed a central part of anti-immigrant activism from the 1980s prominent to greater border militarization rising hesitation of migrants by the border patrol and a focus media on the theoretical criminality of immigrants.
I think the difference is caused by a person or group actually going through with genocide versus an attempt at it, but that's just my best guess?
The Mexican-American war came from America taking Texas. Then that allowed us to receive even more land, more than 500,000.
By not uniting all of South America I hoped that helped ;)
