Question

n what way did the political situation in Vietnam resemble that of Korea in the 1950s?

Both Vietnam and Korea were allied with the United States but then shifted allegiance to the Soviet Union.
Both Vietnam and Korea were unified, Communist countries who then voted to become democracies.
Both Vietnam and Korea were divided and suffered when the South invaded the North.
Both Vietnam and Korea were divided into a Communist North and a non-Communist South.

Answer 1

Both Vietnam and Korea were divided into a Communist North and a non-Communist South.

After World War II and amid Cold War tensions, both countries were split along ideological lines (North backed by the Soviet Union/China, South backed by the United States), which led to major conflicts (the Korean War and the Vietnam War).