Important. Government Project needed Info on Seperation of Church and State thru the Supreme Court

Yes hello this is Jessica and I am doing a project for Government to be able to pass the class, I have been looking thru the net and even went into a chat room to ask people I was wondering if you could help I need to know some decisions made and the history of the seperation of church and state thru the supreme court if you could help that would be greatly appreciated thanks.
Jessica