Usually its because of how close you were or the importance on that thing or it also can be a relatioship
Do not waste your time looking that link up I tried looking my answer up and it said it was fake.
Answer: the Spanish civil wars is sometimes a prelude to world war 2 germany and Italy supported Franco’s nationalist
Explanation: So basically Germany was supporting Franco’s nation and the Spanish people was cool wit them and they wanted to go to war wit them
Well...it might be that old "supply and demand" factor. As one example: a corporation/rancher/farmer might have the "demand" and the immigrant might have the "supply."