Why did Richard Nixon resign as president?

His political philosophies were changing.

He could not handle the pressures of the Vietnam War.

He wanted to avoid removal from office.

His health was failing him.

I believe the correct answer from the choices listed above is the third option. Richard nixon resigned as president because he wanted to avoid removal from office. At the time of his resignation, it was clear that Congress was on track towards his complete impeachment and removal from office due to his role in covering up the Watergate Scandal.