"the 1854 outbreak of cholera that killed six percent of the city’s population." A pretty good motivation to make some changes. I wonder when the last time a U

"the 1854 outbreak of cholera that killed six percent of the city’s population." A pretty good motivation to make some changes. I wonder when the last time a US city had over 5% of its population die in a year. The 1906 SF earthquake/fire was about 1%.