The chart shows the populations of select US regions.

A graph titled Population of the United States by Region has region on the x-axis, and population (millions) on the y-axis. 2000: Overall, 275; northeast, 50; midwest, 55; west, 60; south, 100. 2014: Overall, 325; Northeast, 55; Midwest, 60; West, 75; South, 115.

Which US region was the most populous in 2014?

the Northeast
the Midwest
the West
the South