1.The first human flight was a big deal cause more than half of the rockets have blown up
And because that no one has ever been in space before.Having known that half of the rockets have blown up this great man in history Alan Shepard wanted to continue the mission and succeded and is known for the mission
2.I'm the first one in space sweet I this is awesome!!!!!!!!
3.the first thing that the U.S. sent into space was Ham