Respuesta :
Answer:
1926
Explanation:
The use of rocket engines for aircraft propulsion opened a new realm of flight to the aeronautical engineer. Robert H. Goddard, an American, developed, built, and flew the first successful liquid-propellant rocket on March 16, 1926
Answer: 1926.
Explanation: Developed, built, and flown by Robert H. Goddard, I believe. Hope this helps!