When researching geanealogy, you might notice periods when whole families seemed to die.
This period could be related to epidemics.
1657 - Boston - Measles
1687 - Boston - Measles
1690 - New York - Yellow Fever
1713 - Boston - Measles
1729 - Boston - Measles
1732-33 - Worldwide - Influenza
1738 - South Carolina - Smallpox
1739-40 - Boston - Measles
1759 - North America - Influenza
1761 - North America , West Indies - Influenza
1772 - North America - Measles
1775 - New England - Epidemic
1775-76 - Worldwide - Influenza
1788 - Philadelphia , NY - Measles
1794 - Philadelphia - Yellow Fever
1796-97 - Philadelphia - Yellow Fever
1798 - Philadelphia - Yellow Fever
1803 - New York - Yellow Fever
1820-23 - Nationwide - Fever
1831-32 - Nationwide - Asiatic Cholera
1832 - New York - Cholera
1833 - Columbus, OH - Cholera
1834 - New York City - Cholera
1837 - Philadelphia - Typhus
1841 - Nationwide - Yellow fever
1847 New Orleans - Yellow fever
1847-48 Worldwide - Influenza
1848-49 North America - Cholera
1849 New York - Cholera
1850 Nationwide - Yellow Fever
1850-51 North America - Influenza
1851 Coles County, IL - Cholera
1851 Missouri - Cholera
1852 Nationwide - Yellow fever
1855 Nationwide - Yellow fever
1857-59 Worldwide - Influenza
1860-61 Pennsylvania - Smallpox
1873-75 North America & Europe - Influenza
1878 - New Orleans - Yellow Fever
1885 - Plymouth, PA - Typhoid
1886 - Jacksonville, FL - Yellow Fever
1918 - Worldwide - Influenza