4 | 1961 | - 1961: Berlin Wall Built
- 12 Apr 1961: The first manned spaceflight was launched by the Soviet Union as a part of the Vostok programme of space exploration, with a cosmonaut Yuri Gagarin on board.
- 5 May 1961: The United States became the second nation to achieve manned spaceflight, with the suborbital flight of astronaut Alan Shepard aboard Freedom 7, carried out as part of Project Mercury.
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