The answer is, when he turned on Stalin
The United States presidential election of 1900 was held on November 6, 1900.It was a rematch of the 1896 race between Republican President William McKinley and his Democratic challenger, William Jennings Bryan.The return of economic prosperity and recent victory in the Spanish-American War helped McKinley to score a decisive victory.President McKinley chose New York Governor Theodore Roosevelt as his running mate as Vice President Garret Hobart had died from heart failure in 1899.
The correct answer is D. Congress overrides a presidential veto of a law that establishes a new tax.
Explanation
The principle of checks and balances is a principle of government (constitutional) in which it is established that the branches of the public power (judicial, executive, and legislative) have the right and the duty to act to avoid actions of other branches to power is balanced between the three branches. According to the above, the correct answer is D. Congress overrides a presidential veto of a law that establishes a new tax because it illustrates a situation in which the branch of the legislature (Congress) avoids an action by the branch of the executive branch (president).