The closest country south of Detroit is Canada. Specifically, the Canadian city of Windsor, Ontario is directly across the Detroit River from Detroit.
Canada is the COUNTRY directly south of Detroit, if that's what you're asking. The COUNTY just south of Detroit is Wayne county - which includes Detroit and the southern and near-western suburbs. If you follow the Detroit River south, the next county is Monroe county and hole land
Houston, which is much further south than Detroit or Indianapolis.
Detroit
If you were to draw a line due South of Detroit Michigan, the 1st foreign country it would pass through would be Canada.
Chicago
NO the NORTH
detroit
Detroit
720 miles down I-75 SOUTH.
Canada
global climate change Detroit relocated its automobile plants to the South.