Up until about 1975, it would have been Russia. Since then it is the U.S.A.
This is based on "known" flights.
england
We have sent rovers to Mars but there have been no manned missions.
people were sent up into space to studdy the moon from the space ships
The USSR sent the first animals into space.
Laika a dog was the first animal in space it was sent by the soviet union
China
US
Russia
Russia
Russia
RUSSIA
Russia sent a dog before the US sent chimps.