I have a dream

"I have a dream" these words were declared said by Martin Luther King in on the sixties. For a long over along period of time in America millions of people lived under the oppression of racial discrimination in America. And out of this oppression regression, there was a man, a man with having a dream, a dream of freedom and justice. He had the power, it was the power of ideas this power was of thoughts and it was proved to be the strongest of other powers. This man broke had broken the all shackles of injustice/discrimination  with by just an idea. So we all have to get (we all need - sounds better) this power and believe in our thoughts ideas.

Ideas is a better word to use than thoughts.

This was well written an easy to understand.  My corrections are manily to give what you wrote a bit more power because you are writing about a very powerful speech.

Hope it helps.