Mayor of Jersey City, New Jersey

Columns: # | Mayor | Term start | Term end
15 | James Gopsill | May 6 , 1867 | May 3 , 1868 | Republican | 16 | Charles H. O'Neill | May 4 , 1868 | April 10 , 1869 | Democratic | 17 | William Clarke | April 11 , 1869 | May 1 , 1870 | Democratic | 18 | Charles H. O'Neill | May 2 , 1870 | May 3 , 1874 | Democratic | 19 | Henry Traphagen | May 4 , 1874 | April 30 , 1876 | Democratic | 20 | Charles Siedler | May 1 , 1876 | May 5 , 1878 | Republican

Example questions:
What party did the Jersey City , NJ mayor who was succeeded by Phineas C. Dummer represent ? | When did the term of the Jersey City , NJ mayor who presided over the Jersey Board of Selectmen in the 1930s start ? | When did the Jersey City , NJ mayor who was succeeded by the man who died on September 26 , 1875 complete his term ? | Who did the mayor of Jersey City , NJ that served the most consecutive terms succeed ? | What party did the Jersey City , NJ mayor born on June 1 , 1842 represent ?

Answers:
Democratic | April 19 , 1850 | April 1843 | Robert Gilchrist | Democratic