The united states became a society of consumers in the late nineteenth century. what was the key factor that made that possible

Industrial Revolution is the correct answer.

Before the Industrial Revolution, most goods were either homemade or bought from local stores. During the rise of industrialization in the United States, Americans had great access to consumer goods. Companies were investing lots of money on advertising and offering shoppers more convenient ways to place orders. Since big companies were producing a big variety of products and fighting over customers, the prices were lowered which made it possible for even the lower classes to have the opportunity to make purchases.

part a. there were 250 teenagers surveyed (100% of tenagers = 250)therefore 1 % = 250/100 = 2.5 76% = 1% x 76 = 2.5 x 76 = 190 teenagers of the 250 surveyed liked burgerspart b: jane surveyed 25% (which is equal to 50 teenagers, i.e. a quarter of the teenagers surveyed is 50) to get 100% we simply get 4 quarters, i.e. multiply 50 by 4 = 200 teenagers were surveyed by jane. part c: it is impossible to give an example where a percentage is greater than 100%, since, by definition , percentage means "per 100".