I was thinking about this recently...and thought I'd take a shot at this.
Below is my list of the most significant course built in the US in each decade going back to 1960. I've also shared the reasons why I nominate each course for this distinctive honor.
I'm certain that my list is not flawless, and (because I'm hungry to know the truth) I'd love for others to add and subtract from my list and offer supporting statements for your opinion. I look forward to reading the answers.
Here is my list of the Most Significant Courses Built in the US over the last six decades:
1960's- The Golf Club...Pete Dye was just getting started and revealing his genius. He built the back 9 at Crooked Stick, then paused and went over to Columbus and built The Golf Club. His iconic design there began a renaissance in architecture, away from a less than inspiring period after the golden age, and up until the moment Pete burst onto the scene. Pete's work would change golf architecture, and for the good. His design work at The Golf Club still stands today as one of his greatest golf courses.
1970's- I'm sticking with Pete, and going with Harbour Town. Pete proved that you didn't need an amazing piece of property to build a great golf course. His utilization of strategic design principles was taking full flight with this design, built over essentially flat property. The course, among the shortest on the PGA Tour, still challenges the world's best players (how does he do that?).
1980's- Darned if I don't have to go with Pete again. TPC Sawgrass might be Pete's most significant course. Built on a terrible piece of property (can I sell you some swamp land in Florida?), Pete built a course that is still considered an iconic golf course on the PGA tour rotation. The course is a lesson in strategic design, and proved that a great architect can overcome a poor site. Sadly, this achievement seemed to keep Mr. Dye out of the running when someone had a superior site, as Pete did not get as many chances at building on ocean front sites as he no doubt deserved.
1990's- I go with Sandhills in the 90's. It may have been the genesis for "remote golf" in the US, and put Coore and Crenshaw on the map with a big-time statement. C & C were obviously here to stay, minimalism was a new buzzword, "finding golf holes" was once again embraced as an architectural principle, and Sandhills has never faded from the scene.
2000's- For me, it has to be Pacific Dunes. Tom Doak's career was taking off, and he was given an amazing site to create something special...which he did. "Remote golf" in the US took another (big) step forward, and Oregon became a big-time golf destination.
2010- I'm going out on a bit of a limb here and picking Sweetens Cove. Rob Collins' work there is significant, to me, for the fact that they are making a true effort to offer a less expensive version of golf. The 9 hole course required less land to build and less construction expense (and will require a much lower maintenance budget than an 18 hole course). The course gets great reviews, and introduces the potential of "golf in 90 minutes" a concept that could boost golf's future in the US.
That's all I got. Would love to hear potential additions or corrections to this list.
TS