American engineer Squire Whipple published the first correct analysis of the precise ways that a load is carried through the components of a truss, which enabled him to design stronger bridges with fewer materials.

United States

About 14,000 covered bridges have been built in the United States, mostly in the years 1825 to 1875. The first documented was the ''Permanent Bridge'', completed in 1805 to span the Schuylkill River

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