had been overturning
-había estado volcando
Past perfect progressiveconjugation ofoverturn.There are other translations for this conjugation.

overturn

Buoyed by his landslide win in 1936, which decimated the GOP in Congress, Roosevelt in early 1937 astonished the nation by announcing his plan to add six more justices to the nine on the Supreme Court who had been overturning New Deal legislation.
Alentados por su victoria aplastante en 1936, que diezmó el GOP en el Congreso, Roosevelt a principios de 1937 sorprendió al país al anunciar su plan para añadir seis jueces más a la nueve en el Tribunal Supremo que ha estado revolucionando legislación del New Deal.
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