Question

click to correct any capitalization errors.
after world war ii, the soviet union and the united states both proposed missions to mars, but neither sent a manned spacecraft there.
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Explanation:

Proper nouns (historical events, country names, planets) need consistent capitalization. "World War II" is a specific historical event, so "War" must be capitalized. "Soviet Union" and "United States" are official country names, so all key words are capitalized. "Mars" is a planet name, requiring capitalization, while "Missions" is not a proper noun here, so it should be lowercase.

Answer:

After World War II, the Soviet Union and the United States both proposed missions to Mars, but neither sent a manned spacecraft there.