Final answer:
True, the ENIAC was developed during World War II to aid in the U.S. Army's artillery trajectory calculations, representing a significant advance in digital computing and its military applications.
Step-by-step explanation:
The statement that the ENIAC was built to aid in the war effort in the mid-1940s is True. The Electronic Numerical Integrator and Computer (ENIAC) was indeed first developed during World War II to calculate artillery trajectories for the U.S. Army. This digital computing device performed calculations at electronic speed instead of mechanical, representing a significant technological leap. The development of ENIAC and its application in military operations during World War II helped pave the way for the commercial proliferation of electronics in everyday life after the war.