Even after all these years, America is still a growing country. But not every place is getting bigger at the same pace.  The 15 U.S. cities with the largest growth in population this past year are mostly in the South.

FOX's Eben Brown reports from Miami:

Except Arkeny, Iowa, the cities attracting the most people are all in the South or West. And most of them are in Texas:

(Gibb) "When we say 'fastest growing' we're looking at the percent change between 2014 and 2015. Georgetown, Texas, is now our fastest growing city with more than 50,000 people. It had a population increase of almost eight percent."

Sarah Gibb with the U.S. Census Bureau. The city that lost the most population? Detroit. More than 3,000 residents left. But New York City retains its title as the nation's most populous.

In Miami, Eben Brown, FOX News.

Follow Eben Brown on Twitter: @FoxEbenBrown