1930s: Big game hunting is a popular sport for Europeans in Africa.

1990s: Many big game animals are endangered and live in wildlife preserves. Hunting is severely restricted, and harsh penalties are imposed for poaching. .

1930s: Leisure travel, particularly overseas, is available primarily to the very rich, who can afford the cost as well as the time it takes to get there and back.

1990s: Intercontinental travel is common for the middle class. Airplanes have replaced oceanliners, making the trip more affordable and much quicker.

1930s: The United States endures the Great Depression. In 1936,38 percent of families make less than $1,000 per year, when the Bureau of Labor Statistics identifies the poverty level as $1,330.

1997: The United States, after suffering a comparatively mild recession during the late 1980s and early 1990s, enjoys a long period of growth and economic recovery.