I went through, probably, 3/4 of the images available through that link, deciding on the way that I wouldn't mind taking the course they were assembled for. But, what really caught my eye wasn't the architecture, but the sculpture, painting, and poster art.

Those face each other across the entrance of the Post Office at 9th and Chestnut Streets in Philadelphia. They're dated 1940 -- the sculptor is Donald De Lue, who also created this for the US cemetery at D-Day's Omaha Beach, and this:

(which I found here,for the 1964 World's Fair... not all that different in style from Soviet heroic art.

It was also the era of the WPA Arts Projects. I could spend all afternoon looking for examples... but if you've ever seen any of the thousands of murals painted in post offices, schools and other American public buildings from 1935 - 1943, you may understand my point: "Socialist" Realism as a style of art is nearly indistinguishable from "Capitalist" Realism.