Herman HOLLERITH
1890 - June 1 – The United States Census Bureau begins using Herman Hollerith's tabulating machine to tabulate census returns using punched card input,

On June 1, 1890, the United States Census Bureau began using a revolutionary new device to process census data: Herman Hollerith’s tabulating machine, which read information encoded on punched cards. Prior to this innovation, census data had to be counted and analyzed entirely by hand—a laborious process that for the 1880 census had taken nearly eight years to complete. Hollerith’s system dramatically accelerated the process, allowing the 1890 census to be tabulated in just a few years, and demonstrated the power of mechanized data processing on a national scale.

Hollerith’s invention was not merely a time-saving tool; it represented a fundamental shift in the management of information. The use of punched cards to store and sort data laid the groundwork for modern computing, transforming how governments and businesses could organize and analyze large volumes of information. Hollerith later founded the Tabulating Machine Company, which, through mergers and innovations, eventually became the International Business Machines Corporation (IBM), one of the most influential technology companies in history.

The adoption of Hollerith’s machine by the U.S. Census Bureau thus marks a milestone not only in census-taking but in the evolution of computing itself, illustrating how practical administrative challenges can spur technological breakthroughs that reshape society.

June 1, 1890

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