(Reuters) – The Dow Jones Industrial Average, the oldest of Wall Street’s three main stock indexes, dropped 1.1% on Monday, extending the decline from its January peak to more than 20%, meeting a common definition for a bear market. Worries that the Federal Reserve’s war against decades-high inflation is pushing the U.S. economy into a downturn have sent the U.S. stock market tumbling in 2022. With the S&P 500 and Nasdaq already down some 23% and 32%, respectively, from their record highs, confirmation the Dow is also in a bear market is just the latest milestone in 2022’s market turmoil. Whil…