By Noel Randewich and Devik Jain (Reuters) – Wall Street ended lower after a choppy session on Tuesday, with geopolitical tensions flaring after U.S. House of Representatives Speaker Nancy Pelosi visited Taiwan. Pelosi said her trip demonstrated American solidarity with the Chinese-claimed self-ruled island, but China condemned that first such visit in 25 years as a threat to peace and stability. Heavy hitters Microsoft and Visa lost 1.1% and 2.4% respectively, weighing on the S&P 500. All 11 S&P 500 sector indexes lost ground, led lower by real estate, which lost 1.3%. Financials dipped 1.1%….