Ford
Chevy Camaro, and Ford Mustang.
Ford Model T and Model A were the most popular with Chevy Touring a distant second.
The most popular car was the Model T
Car covers are one of the most popular accessories for the Ford Mustang.
Ford, Chevy, Plymouth, Dodge, DeSoto
Ford Fairlaine, Ford Galaxie 500, Mustang, Camaro, Corvette, Chevy Stepside trucks, "round kind" '50s Ford & '40s+ Chevy trucks, Cougars, Pontiac "goats" (GTOs), Dodge Chargers/ Challengers...and that's all I can think of...foreign cars didn't exist for me in the 60s
the most popular car was the VW beetle closely followed by the Ford Mustang and then the chevy nova. The best selling car in the U.S. in 1971 was the Chevrolet Impala/Caprice, not the VW, Mustang, or Nova as the answer above suggests.
ford
Ford was the most popular in the U.S.
The number one selling car throughout most of the 50s was Chevrolet. Ford did outsell Chevy in 1957 but barely. The 1955 Chevy was the most popular car of that decade. 55, 56, & 57 were banner years with all models selling well. Plymouth, Oldsmobile, and Dodge were also popular.
1957 Belair (Chevy)