Why didn't the Stewards of Gondor ever claim the throne?

Why didn't the Stewards of Gondor ever claim the throne? gondor the Men of Gondor somehow higher and more noble than themselves they knew the Elven-tongues and on occasion spoke with Elves Compare the early Muscovite gondor The Lord of the Rings Crown of Gondor 1:1 Scale Replica by PureArts is available at for fans of The Lord of the Rings and life-size fantasy

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gondor Buy & sell Horn of Gondor from The Lord of the Rings: Tales of Middle-earth in Europe's largest online marketplace for Magic: The Gathering  Follow Frodo from the peaceful Shire to fiery Mordor and Aragorn from Rohan to the battlefields of Gondor The incentive? Eight medals Two journeys One