Wall Street’s main indices tumbled on Tuesday, with the Dow Jones Industrial Average plunging more than 550 points amid renewed fears of an economic slowdown in the United States. The sell-off was led by technology stocks, with Nvidia experiencing a sharp decline of more than 9%. Other tech giants also suffered significant losses, with Google’s parent company Alphabet and Apple both shedding more than 3% of their value. The widespread market jitters were reflected in a spike of nearly 25% in the VIX, Wall Street’s so-called ‘fear gauge’. The surge in volatility underscores growing investor une…