You push the button and the past gets rewritten. Apollo isn't cancelled after Apollo 17 and Saturns keep flying, a permanent American base on the Moon is established. N1 is successful and Sovets land on the Moon and likewise establish presence there. By now there are several permanently manned outposts there and man has walked on Mars
BUT
all robotic missions all cancelled
No orbiters, landers or rovers of any kind were ever launched.
Do you press the button?