The three main space programs developed for human space travel and moon missions are NASA (United States), Soviet space program (USSR), and the Apollo program (United States), which was a part of NASA focused specifically on landing astronauts on the moon.
American human flight programs were; Mercury, Gemini, Apollo, Shuttle, the recently nixed Orion, and the up and coming SpaceX Falcon series. The last of which is the largest private space venture in history.
Brazil, Japan, South Africa
The three main space programs are NASA (National Aeronautics and Space Administration) in the United States, Roscosmos in Russia, and ESA (European Space Agency) in Europe. These organizations are responsible for significant advancements in space exploration, research, and technology.
russia france u.s
Four major countries claimed Africa, large parts of Oceania and North America
The first three space programs in the US were Project Mercury, Project Gemini, and Apollo program. These programs were instrumental in advancing human space exploration and culminated in the first human landing on the Moon during the Apollo missions.
England, France, and Spain
britan germany and france
The first three space programs that contributed to the US moon landing were Mercury, Gemini, and Apollo. Mercury laid the groundwork for human spaceflight, Gemini focused on developing techniques for space travel, and Apollo successfully achieved the goal of landing astronauts on the moon.
Four; the United States, the Soviet Union, Russia and China.
The Big Three were the leaders of the three major Allied countries in World War II. They were Franklin D. Roosevelt, Winston Churchill, and Joseph Stalin. You could consider their countries the Big Three, in which it would be the United States, United Kingdom, and Soviet Union.