Final answer:
If President Nixon had not chosen to resign, he would have been impeached and removed from office due to his involvement in the Watergate cover-up and illegal activities.
Step-by-step explanation:
If President Nixon had not chosen to resign, he likely would have been impeached and convicted. The investigations into the Watergate scandal revealed evidence of Nixon's involvement in a cover-up and illegal activities, such as using the CIA to obstruct justice. The release of the White House tapes confirmed these findings and led to Nixon's resignation. Had he not resigned, he would have been removed from office.