Final answer:
The Democratic Party would not regain the White House until 1952 when Republican Dwight D. Eisenhower won the presidency after Democrat Harry S. Truman decided not to run for re-election.
Step-by-step explanation:
The student is asking about American political history, specifically referring to the period in which a particular political party would not regain control of the White House until 1952. The answer to the question is that the Democratic Party would not gain the White House again until 1952. The last Democratic president before this was Harry S. Truman, who, facing low approval ratings and the unpopularity of the Korean War, decided not to run for re-election in 1952. As a result, the Democratic Party nominated Adlai Stevenson, who lost to Republican Dwight D. Eisenhower. Eisenhower's victory marked the first time a Republican would be in the White House since before Franklin D. Roosevelt's presidency, which began in 1933.