In which decade were the first digital computers developed in the U.K. and U.S.?

The first digital computers were indeed developed in the 1940s, marking a significant advancement in computing technology. During this decade, notable projects in both the United Kingdom and the United States laid the groundwork for modern computing.

In the U.S., one of the earliest and most influential digital computers was the Electronic Numerical Integrator and Computer (ENIAC), completed in 1945. This massive machine was designed to perform a wide range of calculations, particularly for military applications during World War II.

Meanwhile, in the U.K., the Colossus, developed around the same time, is often considered the world's first programmable digital electronic computer. It was used to break German codes during the war, making it pivotal in the development of computing.

These innovations in the 1940s established the foundation for subsequent advancements in computing, eventually leading to the more compact and powerful systems that emerged in later decades.