system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] How exactly did Howard Stark acquire the vibranium to build Cap's shield?

Did he manage to do some exploration and mine some of it out?  T'Chaka and T'Challa don't really give Cap any shit for the shield itself, and given Klaue's brand and T'Chaka's statement on the stolen vibranium used to build Ultron's doomsday device, they don't take kindly to thieves.  Does that mean that Howard was able to set up a trade or some other deal to legally obtain it?
gpt
There's no real way of knowing. Howard Stark isn't the kind of guy you could trust to give an honest account (plus he's dead), and Wakandans aren't known for blabbing about internal matters to outsiders.