Manhattan Project was about rockets

What if Manhattan Project was about rockets?
== Timeline ==
1912: Titanic did not sink.
1930: Robert Esnault-Pelterie moves to USA.
1933: Robert Goddard decides to go bold by approaching the media to promote his rocketry. 
1938: US War Department contacts Goddard to persuade him to continue his research with the former.
1939: Start of World War 2.
February 1942: USA successfully test fired the Eagle-1 (E1) missile in Nevadan desert.
October 1942: With help from Wernher von Braun, Nazi Germany test fired their first missiles too. However, those mostly ends in failures due to heavy interference from the Allies.
1945: Hiroshima and Kokura hit by intercontinential rocket barrages from USA. By this time the World War 2 is over, with German rocket scientist like von Braun being spirited to USA. Start of atomic research.
1948: USA launched the first satellite Pioneer. Chuck Yeager broke the speed of sound.
1949: The civil war in China became a stalemate after Mao Zedong was killed. Soviet Union fires its first rockets.
1950: Korean War where rocket barrages were exposed as quite ineffective. Therefore atomic weapons project gets underway.
1951: US launched Chuck Yeager into cosmos, making him the first man in space though not into orbit. Both US and Soviet Union made their first nuclear reactors.
1955: US exploded its first atomic bomb.
1958: US astronaut John Glenn became the first man to orbit the Earth. Soviet Russia launched their first satellite.
1959: Soviet Union exploded its first atomic bomb. Cuban Revolution.
1966: First manned spacecraft to orbit the Moon was sent by US.
1969: US citizen Neil Armstrong is the first man to step foot on the Moon.
1971: USA launched the first space shuttle. Meanwhile by this time the US had launched the world's first space station and had sent first probes to Mars and the rest of the planets.
1989: The restoration of democracy in China.
1991: Fall of the communist regimes all over the world.
1993: US started new era of the Space age by launching improvised spaceplanes.
1996: Spaceplanes Falcon, Hawk, Condor, and Eagle together were used to build the US Space Station Alpha.
August 18, 2001: The US returned to the Moon by landing the first woman there.
2017: US set up a base on the far side of the Moon.
2020: US lands the first persons on Mars.