3. The 1950s saw the birth of the fast food industry, with the introduction of McDonald's and Burger King.

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1.
hamburgers
2.
frenchfries
3.
milkshakes
4.
driveins
5.
carhops
6.
ronaldmcdonald
7.
whopper
8.
bigmac
9.
shakeshack
10.
innout
11.
fiveguys
12.
sonic
13.
whitecastle
14.
colonelsanders
15.
kfc
16.
tacobell
17.
pizza
18.
hotdogs
19.
fastfood
20.
convenience