1949: Downfall of the Red Sickle

A TL where the 1949 Berlin crisis turns hot causing the Soviet bloc to be exterminated.

Timeline
1917: After being deposed by the Russian revolution, Czar Nicholas II and his family emigrates to the United Kingdom.

1939: Johann Georg Elser wounded Hitler in an assasination attempt.

1945: The end of World War II.

1949: The Berlin crisis between US and USSR turns hot, causing the latter to be nuked.

1950: The whole communist bloc is disbanded.

1953: Sergei Korolev emigrates to America.

December 6, 1957: USA launched Vanguard 1 the first satellite into space.

1958: NASA is formed, their spacecraft "Pioneer 1" is the first to escape the Earth-Moon system.

1960: Joe Walker is the first man in space, with a suborbital flight of the X15 spaceplane.

March 1961: An X-15B spacecraft carries Neil Armstrong into orbit, hence became the first man to do so. At the same time Alan Shepard became the first man to ride a ballistic rocket into space.

1965: Ed White is the first man to walk in space.

1969: Neil Armstrong and Buzz Aldrin land on the Moon.

1977: Voyager interstellar spacecrafts are launched and Voyager 1 will become the first spacecraft to enter interstellar space.

1983: After much testings, the American Manned Mars mission is finally launched. When the NASA spacecraft, equipped with NERVA booster finally reached to Mars, Neil Armstrong, who volunteered to participate in the manned program to Mars, becomes the first man to step foot on Mars after walking out from the Martian Excursion Module. Armstrong is joined with astronauts Buzz Aldrin and Alan Shepard while on Mars.

The astronauts in the Martian manned program will successfully return to Earth later.

1998: The first parts of a gigantic von Braun rotating wheel Space Station is launched into orbit around Earth.

2016: Completion of the gigantic space station. A colony is set up on Mars.