Question

the attempted assassination of what vice president demonstrated the important of robust succession policies in 1865?
franklin pierce
andrew johnson
john tyler

Explanation:

In 1865, Andrew Johnson was Vice President under Abraham Lincoln. When Lincoln was assassinated in April 1865, Johnson succeeded him as President, highlighting the need for clear succession policies. The other options were not Vice Presidents in 1865: Franklin Pierce was a former President (1853-1857), and John Tyler was a former President (1841-1845). Thus, Andrew Johnson is the correct answer.

Answer:

Andrew Johnson