I saw a squidge on it ewlsewhere & began doing further research. This site seems to be the most comprehensive in the background story:
https://www.huffpost.com/archive/ca/entry/heart-canadian-connection_n_2902628
I hadn't heard therewere illegal drafts happening for Viet Nam & thoe who evaded them were not considered guilty of draft evasion.
Still great music -- that vocal range of Ann's -- wow! Kept me coming back to their music for 40+ years now!
I can't help but wonder if all the hype about Heart being Canadian was away to circumvent "Canadian content" laws on Canadian media, by the record studio.
A lie! A bloody lie!
Nothing wrong with San Diego girls, definitely.
Ann followed her "magic man" up here as he fled the [illegal] draft.
The sisters married the two brothers who had formed the earlier versions of the band in Seattle, and were(the girls were) definitely much responsible for the band's earliest successes.
--- BBBS/Li6 v4.10 Toy-6
* Origin: The Rusty MailBox - Penticton, BC Canada (1:153/757)