1960: The United States had close to 4 million farms, which totaled around 990 million acres. The average farm had assets worth almost $53,000 and earned just under $10,000 per year. Around 15.5 million Americans lived on farms.

1990: There were only a little over 2 million farms in operation in the United States, also totaling around 990 million acres. The average farm had assets worth around $460,000 and earned a little over $91,000 per year. Just under 5 million Americans lived on farms.

1960: 1,200 accidental shooting deaths occurred in American homes. Just over 51 percent of polled Americans said they had a gun in the house.

1990s: 800 accidental shooting deaths occurred in American homes in 1995. In 1991, 46 percent of polled Americans had a gun in the house. Of the American households with guns, 40 percent also had children in the house.

1950: There are an estimated 54 million rifles, shotguns, and handguns in the United States. Around 2,399,000 firearms are available for...