Drake's circumnavigation and plunder turned him into the paramount English hero, and the £400,000 he brought back—more than Elizabeth's entire annual income—made his fate a political crisis because England and Spain were not yet at war.
Drake returns a national hero with £400,000 in plunder exceeding the queen's yearly income, forcing Elizabeth to choose between appeasing Spain and backing her most famous predator while the two kingdoms are not yet at war.
transcript
Tom (Rest is History): When Drake returns to England, he is a national hero. Not just because he has achieved the greatest feat of navigation in all English history, but also because he has robbed and humiliated the king of Spain. He has forced his way into what the Spaniards call the Marl Clausum, the closed sea, namely the Pacific. Um, he's ranged at will along the coastlines of uh, western America, Spain's great American empire, and he has plundered so much gold and silver and been given so many clothes that the total sum amounts to more than Elizabeth I's entire annual income. So maybe 400,000 in all. So a huge, huge amount of money.