Glossary entry (derived from question below)
Spanish term or phrase:
que se llevará el primer ventarrón según del lado que soplen
English translation:
swept away in whatever direction those selfish interests resolve to blow
Spanish term
United States
Laudable Lady Linguist
Native in: English 
Works in: Spanish to English, French to English, English to Spanish, and 3 more.
que se llevará el primer ventarrón según del lado que soplen
Si no fuese por los intereses egoístas americanos, a quienes conviene desprenderse de estas Islas, ¿dónde estaríamos ahora con nuestras estériles luchas académicas? ¡Promesas! Promesas que se llevará el primer ventarrón según del lado que soplen esos mismos intereses egoístas, porque si hoy les conviene entretenernos con esperanzas de libertad, mañana les convendrá quizás castigar nuestra soberbia, arrancándonos del pecho todo destello de esperanza.
Mil Gracias,
Barbara
Jan 15, 2021 05:09: Barbara Cochran, MFA Created KOG entry
Proposed translations
swept away in whatever direction those selfish interests resolve to blow
Mexico
Dual-Native English & Spanish Translator
Native in: English (Variants: US, Canadian, British, UK) , Spanish (Variants: Colombian, Uruguayan, Cuban, Puerto Rican, Argentine, Chilean, Venezuelan, Costa Rican, Mexican, Standard-Spain, US, Ecuadorian , Dominican, Latin American, Peruvian)
Works in: Spanish to English, English to Spanish
that will be swept away by the first gusts, either way that [those same selfish interests] may blow
See suggestion below
promises that will be gone with the first strong wind from whichever side those same self serving interests blow
Argentina
🕹️ Spanish (LatAm) Gamer Translator 🕹️
Native in: Spanish (Variants: Latin American, Argentine)
Works in: English to Spanish, Spanish to English
that will wind up blowing us away in the direction of those (very same selfish interests)
-"to find yourself in an unexpected and usually unpleasant situation, especially as a result of what you do"
-"to come to be in a particular situation or condition, esp. a bad one"
Hope my two cents were of help.
worked for int. orgs (IMF, OAS, IDB)
Native in: English
Works in: Spanish to English, German to English
go the way the wind blows as/if it suits them
--------------------------------------------------
Note added at 9 hrs (2021-01-09 03:44:37 GMT)
--------------------------------------------------
might need working around a bit but sounds natural and catches the meaning IMO
Something went wrong...