A list of things Steve Rogers would historically be unfamiliar with:

I fell down a rabbit hole of research about inventions circa the 40s and was surprised by a bunch of things that have been around way longer than I thought and some that are strangely reccent, and compiled them into a list. Aka, a resource for fic writers.

Bananas (or rather, the ones we have today. The ones he’d be accustomed to, the Gros Michel, a sweeter, creamier species, went extinct in the 50s and was replaced with the bland Cavendish banana.)
High-fives (the low-five was actually invented first, around WW2, and he may have been familiar with that)
Buffalo Wings (invented in the 60s)
CPR (not really used until the late 40s, not widely known until the 50s)
Tiramisu (invented in the 80s)
Big Macs & McNuggets (while McDonald’s was founded in 1940, the former wasn’t introduced until the 60s, and the latter, the 80s)
Seat belts (the first car to have one was in the late 40s, and only became mandatory to wear them in the 80s. holy shit.)
Walmart (invented in 1962. Or really, the large-scale supermarkets as we know them today really)
Yellow tennis balls (prior to the 70s they were usually black or white)
Panadol (first sold in the US in the 50s)
The smiley face aka :) (popularised in the 60s)

Now alternatively, here’s a list of things Steve WOULD (or possibly would) be familiar with:

I’m not sure why some of these surprised me.

Modern Sunglasses (have been around a lot longer than I thought, and were mass produced in the 20s)
Nokia (was first founded in 1865. I’m not kidding. They began as a pulp mill and moved into making rubber respirators for military from the 30s onwards)
Nintendo (been around since 1889 as a toy company, during the 40s they made playing cards. Wouldn’t be implausible that he knew about Nintendo, perhaps from Morita)
Krispy Kreme (opened in 1937, didn’t spread widely until the 50s however)
Kool-Aid (introduced in the 30s)
Oreos (introduced in 1912)
Printed/graphic tees (didn’t become a trend until the 60s-70s, but they certainly existed in the 40s)
Hoodies (originated in the 30s, worn by workers in cold New York warehouses. Meaning, it’s entirely plausible Bucky could’ve been wearing hoodies in the 40s)
Malls (they weren’t called that back then, but they certainly had shopping centres or plazas since the 1800s)
Converse sneakers (invented in 1908 and have barely changed since!)

I didn’t expect anyone to really reblog this wow! Here’s a couple more things to add to the list:

Would not have known about:

Velcro (patented in 1951)
Modern Sunscreen (in 1944 they had ‘Red Vet Pet’, used by soldiers it was described as a “disagreeable red, sticky substance similar to petroleum jelly”)
Bubble Wrap (1957)
Slinkies (Not sold until 1947)
Microwave oven (invented just a year after he went under)
Frisbees (invented in 1948)
Acrylic paint (not sold commercially until the 50s)
Roller blades (1979)

Would have likely known about:

Reeses’s Peanut Butter Cups (introduced in 1928)
Mountain Dew (introduced in 1940)
Twinkies (1930)
M&M’s (1941)
Lay’s Potato Chips (1932)
Tootsie Pops (1931)
Levi’s Jeans (been around since the 1850s!)
Duct Tape (been around since the early 1900′s, at this time it was called duck tape)
3-D movies (the first 3-D movie with the red/blue glasses was in 1922!)
Monopoly (1935)
Nescafe coffee (1938)

Coming back to this because I found out a few more!

More things he would likely not be familiar with:

Butter chicken (1950s)
Wireless TV remote (invented 1955)
Superglue (not sold until 1958)
Saran wrap (1949. ok and cool fact, the name Saran comes from the combined names of the creators cat and dog, Sarah and Ann!)
Colour TV (invented in his time, but not broadcasted until the 50s)

Things he would possibly/likely be familiar with:

Electric guitars (invented 1931)
Electric washing machines (as early as 1904. Although they look nothing like they do now though and I doubt he could afford to own one.)
Laundromats (since the 30s or earlier)
Electric razors (produced in 1937)
Air conditioner (invented in 1902)
Pop up toaster (1919)
Robots (in 1928 the humanoid robot Eric was created. Funnily enough around that time the word ‘robot’ was pronounced as ’row-bit’)
Pez candy (1927)