Who is credited for writing the American Declaration of Independence?
Thomas Jefferson wrote the first draft of the Declaration of Independence for the United States of America, in addition to making many/most of the important edits to it. Some others did participate in the writing of it, but it's Thomas Jefferson who contributed the original write-up and was most influential in it's development, and as such, he is credited for the writing of the historical document.
Thomas Paine's publication of Common Sense called for a manifesto to be published explaining why the American Colonies were forced to break ties with Britain. That manifesto was later published and is known as the Declaration of Independence. While Thomas Jefferson is credited with writing the Declaration of Independence, there is some evidence that Paine contributed significantly to its writing.