Ireland does not have a vice president. No such office exists. Ireland just has a president. If a president dies or resigns a new president is chosen.
The President of Ireland is Michael D. Higgins, who took office on the 11th of November 2011.
lyndon B Johnson became the new president novanet
The president of Ireland would have no role in such decisions. The president of Ireland is the head of state, not the head of government, and so has no role in running the country or setting policies.
Julius Kambarage Nyerere became president of the new nation, Tanzania in 1962
Eamon De Valera, born in the United States in 1881 (either New York or New Mexico, the history is unclear), was the long-serving President of Ireland. Joseph Jenkins Roberts, a free African American born in 1809 in Virginia, became the first President of Liberia. Those are the only two I know of.
Ireland's head of government is called a Taoiseach, not a Prime Minister. There has never been a female Taoiseach. The head of state is the President. Ireland has had two female presidents, first Mary Robinson (1990 - 1997) and then Mary McAleese (1997 - 2011).
Ataturk became the president of Turkey when the country became a republic and a new government was instituted.
When Lincoln was assassinated, Vice President Andrew Johnson became the new President. No new Vice President was chosen; the office was vacant until Ulysses Grant was elected President in 1868 and Schuyler Colfax became Vice President. This is why the Constitution was amended in 1967, with the 25th Amendment. It finally set rules for how a new Vice President is chosen when the sitting Vice President has to take over the Presidency.
The office of governor general was replaced by the president of the republic. The constitution was changed to a a new republican constitution. Trinidad ceased being a monarchy. The president replaced the queen as head of state. Trinidad now prints its own currency (money).
He became the new democratic of South Africa.
George Washington