Also, Aragorn didn't make a claim for the throne of Gondor earlier because he knew it was at war with Mordor and he didn't want to weaken Gondor by creating another round of kinstrife. He only wanted to make a claim after the war with Sauron was finished, and he had made a large contribution to to victory of Gondor.
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His sword was long his lance was keen
His shining helm afar was seen
The countless stars of heavens field
Were mirrored in his silver shield
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