Gotta go with Ford's Pedigree champ.
1949 - First NASCAR race run on June 19 at Charlotte, N.C., won by Jim Roper in a Lincoln.
1951 - Jim Flock is first driver to qualify quicker than 100 mph, he does so driving a Lincoln at the old beach race course at Daytona Beach, Fla.
Look up the GT40 MkII/IV's that kicked Ferrari in the nuts from 66-69. Also the MK IV (67) IIRC, is STILL the only American built race car to win overall at Le Mans.
Ayrton Senna almost won a 4th GP Driver's Title in a SEVERELY underpowered McLaren/Ford in 1993 (managed 5 wins and 2 2nd's on his skill alone).
Ford has a successful Rally Program. GM and Dodge cannot hang in WRC, nor will they ever.
I don't want to downplay Ford's achievement in beating Ferrari at Le Mans, but it's still nothing parading around like you are "the big dog".
Ford sure prepared hard and achieve their goals to beat Ferrari at Le Mans for 4 years in a row, ending 6 consecutive years of Ferrari domination ... domination at Le Mans they never got back BTW. But still 4 victories is as much as Alfa Romeo
, short of Jaguar, short of Bentley ... half from Ferrari/Audi 9 victories ... and way short of Porsche's
16 wins.
Let's not forget Ferrari owned Ford before the GT40
and after the GT40 on their on turf with "the other" famed endurance race, the 12H of Sebring. 3 Ford victories compared to 12 by Ferrari,
18 by Porsche, 9 by Audi ... heck even Nissan beats Ford with 4.
Rally being traditionally dominated by little nimble Euro/Asian shoeboxes, American manufacturers don't have much to offer. Lucky GM had a couple of Opel they could throw in their in the 80s, and lucky Ford has that Euro shoebox called the Fiesta that they decided to make a push with to increase their market share. Still despite their 06/07 championship, Ford scored 3 total, compared to 10 by Lancia, 6 by Citroen, 5 by Peugeot ... neck to neck with Subaru/Toyota's 3 championships.
I think where Ford shined was building engine for F1s, and got an early start with Lotus ... racking up 10 Engine championships ahead of Renault (9) ... but still way short of Ferrari
16, and Ferrari makes their own cars.
Anyway, each manufacturer has his fetish series, and when their set their mind/$$$$ can de-throne who ever is on top in a specific niche, but the real achievement is to stay on top. On a side note, I'm really looking forward to see how Audi/Peugeot will adapt to this year's Le Mans drastic changes and who's going to end up on top.