Where is the largest area of concentration of manufacturing and trade in the US?

Louisville, the city of Kentucky is the largest area of concentration of manufacturing and trade in the US.

Explanation:

The United States ranks the second largest manufacturer in the world with a record of $2.00 trillion. America's manufacturing sector has added fuel in the field of employment.

Over long period of time, employment sectors are evaluated to determine the highest manufacturing places. The top 10 regions for manufacturing and trade growth are in red states.

Louisville, the city of Kentucky is the largest area of manufacturing and trade in the States of America.