That article is talking about a 5100M. It appears most of the 5000 series are "built" in Georgia (the rest are made in India), as are a couple 2000 series (the rest are from Japan), and the 1023r. (Using Japanese engines, German gear boxes, Canadian FELs, as well as components from China and half a dozen other countries.) It appears the 1025r also used to made here, maybe up to around 2012 or so. Tractor Data lists its current factory location as "unknown." Most of the 4000 series are made in Mexico.
Like other tractor makers, John Deere is a truly international company. John Deere has 6 facilities in Germany alone. Their factory in Mannheim, Germany, produces 30,000 6-series tractors per year, 28% of which are exported back to North America. It also builds the gear boxes that are then shipped to John Deere factories around the world.
JD has built their tractors in or sourced components from so many different countries over the years, and frequently switches, that it's complicated to figure out where a particular model is built or assembled, and where its components were manufactured.
Some of the larger JD specialized farming equipment are still manufactured in the U.S. and use more American components.
I personally have no problem with any of this, like ViperDriver said, as long as it's a good tractor. Sure it would be nice to get back some of our manufacturing base but it appears that train has left the station and isn't coming back.