Instituting quarantines , however , meant Federal intervention into what was widely held to be state police powers .
Instituting quarantines , however , met resistance in the southeastern United States where the issue of yellow fever , and its impact on trade , were most critical .
Instituting quarantines , however , meant Federal intervention into what was widely held to be state police powers and met resistance in the southeastern United States where the issue of yellow fever , and its impact on trade , were most critical .