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May 6, 1844 - An anti-Catholic riot Kensington , the riots continue for three days.
May 10, 1876 - the Centennial Exposition Ulysses S. Grant and Brazilian Emperor Dom Pedro and their wives.
May 10, 1877 - Pennsylvania Museum and School of Industrial Art opens the museum which would eventually become the Philadelphia Museum of Art
May 12, 1985 - After a gun battle with members of MOVE Philadelphia police drop a bomb on the MOVE compound starting a fire that destroys 61 houses and kills eleven MOVE members.
May 16, 1957 - The Walt Whitman Bridge Camden, New Jersey .
May 18, 1778 - The Mischianza fête given in honor of British General Sir William Howe is held.
May 28, 1755 - Construction of Pennsylvania Hospital hospital in the United States, begins.
