Q: Into what estate did the fall bring mankind?
A: The fall brought mankind into an estate of sin and misery.

Romans 5:12. Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned.
Galatians 3:10. For as many as are of the works of the law are under the curse: for it is written, Cursed is every one that continueth not in all things which are written in the book of the law to do them.

Westminster Project - See John Flavel's explanation of Original Sin