1930s: Alcoholic Anonymous (AA) is founded in Cleveland, Ohio, and within four years its membership grows to 100.

1950s: The Twelve Step program of AA offers those who are suffering from alcoholism a way to grapple with their dependence. It is estimated that there are now over 100,000 members in AA.

Today: Membership in AA is now international and includes over 2 million members.

1930s: Dogs and cats roam freely without restrictions and without protection from cruelty caused by humans.

1950s: The American Humane Association is formed in an attempt to protect animals.

Today: It is estimated that over 40,000 dogs and cats are euthanized each day in various animal shelters and veterinarian offices throughout the United States.

1940s: During World War II, women take on a more independent role in American society, and birth rates drop as divorce rates rise.

1950s: It is calculated that there are...