Final answer:
The subject of the question is History and it lists several assassinated presidents throughout American history.
Step-by-step explanation:
The subject of the question is History. The question lists several presidents who were assassinated, including:
- Abraham Lincoln
- James A. Garfield
- William McKinley
- John F. Kennedy
- Franklin D. Roosevelt
These assassinations occurred during different time periods in American history. For example, Abraham Lincoln was assassinated in 1865, while John F. Kennedy was assassinated in 1963. Each assassination had its own unique circumstances and impact on the United States.