Final answer:
The FBI connected the Watergate break-in to Nixon through testimony, the discovery of a taping system, and connections with his top advisers.
Step-by-step explanation:
In the investigation of the Watergate break-in, several key events connected it to President Nixon:
- Testimony revealed that Nixon knew about the break-in and ordered a cover-up.
- The discovery of a taping system in the Oval Office that recorded conversations.
- The Washington Post uncovered connections between the break-in and Nixon's top advisers.
These events led to the resignation of several top officials and the eventual impeachment and resignation of President Nixon.