Did the Chinese Discover America ?

I was very surprised when I started to read about this  topic . All  the time  it has been  known that the only person that discovered America was Christopher Columbus , but according to the reading it has theorized that  Zhen He arrived to America before Christopher Columbus .

It is interesting to know that there is another history about the Discovery of America, a history that left  me very  suprised because since  l was a child , l have always known it was Christopher Columbus who discovered America.