Air conditioning is invented.

The first motor-driven hook-and-ladder truck, the "Mack," is introduced.

Charles Kettering invents the first electrical automobile self-starter.

21 Feb.

The United States and Japan sign a navigation and commerce treaty that includes the conditions reached in 1907. The treaty opens both nations to further trade.

The Supreme Court rules that the Standard Oil Company of New Jersey must be dissolved as an unreasonable combination in restraint of trade under antitrust laws.