One of the main musical waves of the era was calmer, softer rock. A major group called The Beatles was so popular at this time that it was called Beatle Mania. The Beatles were one of many bands to come to America, or many more would come to earn the title of the British Invasion. During the 1960s, the American economy was growing strongly. This period focused on the housing and computer industries which dominated automobiles, chemicals and electrical consumer durable goods, which were the leading sectors in the 1950s. Agriculture fell from 19.2 to 7.5 percent, the minimum wage increased from $1.00 to $1.25, and unemployment was around 6 percent. Another economic point is the growing middle class. Between 1945 and 1960, median family income, adjusted for inflation, nearly doubled. Rising incomes have doubled the size of the middle class. Before the Great Depression of the 1930s, only a third of Americans were middle class, but in postwar America, two-thirds were. Many middle-class families in postwar America became suburban families. Of the 13 million new housing units built in the 1950s, 85 percent were in the suburbs. The GI Bill contributed greatly to this growth. Soldiers returning from war would receive a government loan to buy a home or attend college. Make college a social norm. Which still affects society today, demanding more jobs requiring a college degree. Political culture became more focused on containing communism, with the theory being called the Domino Theory: "Military intervention in Korea and Vietnam." Finally, you have broader considerations that might follow what you would call the principle of falling dominoes. You arrange a row of dominoes, you knock over the first, and what will happen to the last one is the certainty that it will pass very quickly. So you could have the beginnings of disintegration