Final answer:
The Marshall Plan successfully prevented suffering and the spread of Communism in post-World War II Europe by providing financial aid for economic recovery, infrastructure rebuilding, and modernizing financial systems.
Explanation:
The Marshall Plan was successful as it played a crucial role in preventing suffering and halting the spread of Communism in post-World War II Europe.
It helped participants by providing significant financial aid, totaling $12.4 billion, that was used for economic recovery, rebuilding infrastructure, and modernizing financial systems. The Plan also boosted Western Europe's economy, leading to stability and undermining support for Communist parties.
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