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In an unlikely story in CAPTAIN AMERICA 215, by Roy Thomas with Tuska/Marcos art, a retro-fitted story tells of events after Captain America's seeming death in 1945, where he was frozen in a block of ice and worshipped by Eskimos for 20 years.
Until he was revived by Lee and Kirby in AVENGERS 4 in 1964.
https://readallcomics.com/avengers-v1-004/

But Roy Thomas expanding onto that story in CAPTAIN AMERICA 215, back in 1945 with Cap appearing to be dead, then-president Harry Truman arranges an imposter to pretend to be Captain America, to stand in and boost the U.S. military's war effort in the closing months of World War II. Along with a less than spectacular re-telling of Cap's origin.
You could argue Roy Thomas did a valiant job of tying up all the loose threads, referencing over a hundred issues or so of past continuity. But for me it was a bit half-hearted.

https://readallcomics.com/captain-america-v1-215/




[Linked Image from static0.cbrimages.com]

I much prefer the flashback stories in CAPTAIN AMERICA 250 and 255
In issue 250, by Roger Stern and Byrne/Rubinstein, Cap is pressured to run for president.

255, the last issue by Stern and Byrne/Rubinstein is a more straightforward re-telling of Cap's origin.
Along wih Cap again clashing with Adolf Hitler, and meeting reverently with president Franklin Delano Roosevelt, who before meeting Cap also orchestrated the experiment that gave Steve Rogers the super-soldier serum, that made him into Captain America.
A really nice aspect of 255 is, the flashback segments to World War II are reproduced from Byrne's un-inked pencils, whereas the modern-day portions are inked by Rubinstein, that gives an interesting texture and contrast to the art, and gives a more Golden Age-compatible look to the flashbacks.

https://readallcomics.com/captain-america-v1-250/
https://readallcomics.com/captain-america-v1-255/

https://readcomiconline.li/Comic/Captain-America-1968/Issue-255?id=9497