Why wasn't Nixon impeached or punished for the Watergate scandal?

Question

It seems like all he did was simply resign and walk away in disgrace, and everyone moved on.....

Answer 1

He was not impeached because he resigned before the House of Representatives voted on whether to impeach him.

He was not punished because President Ford pardoned him.

Answer 2

He resigned to avoid being impeached and he didn't go to prison because Ford pardoned him. 

Answer 3

He resigned, and then President Ford pardoned him.

Answer 4

he resigned                            .

Answer 5

he resigned before he was impeached, and Ford pardoned him, Trump hasn't been pardoned of crap 

Answer 6

He resigned when it became obvious he was going to be convicted by the Senate, he lost support of GOP Senators at that point