The degree of the adjective weakest in the sentence would be superlative. In the sentence '<span>Lighter metals meant that even the weakest horses could carry armored knights.', superlative is the degree of the adjective 'weakest'.</span>
Degrees of comparison can be positive, comparative, or superlative. Note that degrees of comparison are all adjectives. Positives describe only one noun. Comparatives compare only two nouns. And, superlatives will compare three or more nouns. The degrees of comparison (from positive to superlative) for the word qualified are qualified, more qualified, and most qualified. Because it is quite obvious that there are more than just two horses being referenced here, "weakest" is a superlative.
Answer:The speech reflected lincolns redefined belief that the Civil War was not just a fight to save the Union, but a struggle for freedom and equality for all.
