Which South American river has more than 1,000 known tributaries?

Which seven-letter word names a planted area of fruit or nut trees? What is the German word for "German"? Phil Collins, Mike Rutherford and Tony Banks were members of which band? Only seven months into his term, which president saw the stock market crash in October 1929? Seven policemen died after a bomb was thrown in 1886 when police broke up a workers' meeting in which Chicago square? Which seven-time NASCAR champion died in a last-lap crash at the 2001 Daytona 500? Seven weeks after the Alamo, Sam Houston took which Mexican leader prisoner at the 1836 Battle of San Jacinto? In 1968 Ruth Eisemann-Schier became the first woman on which list?