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Mercury, Gemini, and Apollo.
The two projects before project Apollo were Project Mercury and Project Gemini. Project Mercury was the first human spaceflight program in the United States, while Project Gemini was the second program that focused on developing space travel techniques to prepare for the Apollo missions to the moon.
The Gemini space program officially ended in 1966. Gemini was an intermediate space program conducted by NASA between the Mercury and Apollo programs, focusing on testing the capabilities necessary for the Apollo missions to the moon.
The two US manned space programs that preceded Apollo were Mercury and Gemini. The Mercury program aimed to put a human in orbit around the Earth, while the Gemini program focused on developing the necessary skills and technologies for space travel to the Moon.
Mercury was first, followed by Gemini and Apollo.
Gemini
The Gemini program came first. It was a precursor to the Apollo program and its main goal was to develop the techniques needed for the Apollo missions to the moon. The Apollo program followed the Gemini program and its main objective was to land humans on the moon and bring them back safely to Earth.
I think it was Gemini.
Gemini. Mercury had one astronaut at a time, Gemini had two, and Apollo had three.
NASA was still a young agency when Apollo was introduced. The first space program was Mercury, whose mission was to launch astronauts, one at a time, into space and then into orbit. Following Mercury was the Gemini program. Gemini spacecraft held two astronauts and saw was the first to really start with science and gear experiments. It was during Gemini that Ed White became the first American to perform an EVA (spacewalk). Apollo directly followed Gemini, and the Space Shuttle program followed Apollo.
Gemini
The Gemini Program