What terms are suitable to express the takeover of a Vice President in the event of the death of a sitting President

In My Humble Opinion
1

Other than ‘take over as President’ what other words or phrases are appropriate?

2

Sorry my post should have read in the event of the death of a sitting President

3

“Began their term as the Xth President of the United States.”

4

Fixed.

5

“Succeeded to the Presidency”?

6

Assumed the office of President.

7

Headlines from when LBJ took over for JFK

Johnson Takes Oath
Lyndon Johnson Sworn In
Lyndon Johnson Assumes Office
LBJ Takes Oath Of Office
LBJ Sworn In
Johnson Sworn In On Plane
Johnson Sworn as President
Johnson Becomes President
Johnson Takes Government’s Reins
Johnson Is President

8

The Vice President’s accession to the Presidency.

9

Thanks engineer_comp_geek. That just about covers most of the terms.