In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

Q: The expansion of what further cemented Houston's emergence as a powerhouse commercial city?, Context: By 1860, Houston had emerged as a commercial and railroad hub for the export of cotton. Railroad spurs from the Texas inland converged in Houston, where they met rail lines to the ports of Galveston and Beaumont. During the American Civil War, Houston served as a headquarters for General John Bankhead Magruder, who used the city as an organization point for the Battle of Galveston. After the Civil War, Houston businessmen initiated efforts to widen the city's extensive system of bayous so the city could accept more commerce between downtown and the nearby port of Galveston. By 1890, Houston was the railroad center of Texas.

A: bayous
****
Q: What type of ammunition would not have been common in 1940?, Context: Until the 1950s guns firing ballistic munitions were the standard weapon; guided missiles then became dominant, except at the very shortest ranges. However, the type of shell or warhead and its fuzing and, with missiles the guidance arrangement, were and are varied. Targets are not always easy to destroy; nonetheless, damaged aircraft may be forced to abort their mission and, even if they manage to return and land in friendly territory, may be out of action for days or permanently. Ignoring small arms and smaller machine-guns, ground-based air defence guns have varied in calibre from 20 mm to at least 150 mm.

A: guided missiles
****
Q: what place is mentioned last?, Context: In 1999, Schwarzenegger sued Dr. Willi Heepe, a German doctor who publicly predicted his early death on the basis of a link between his steroid use and his later heart problems. As the doctor had never examined him personally, Schwarzenegger collected a US$10,000 libel judgment against him in a German court. In 1999, Schwarzenegger also sued and settled with The Globe, a U.S. tabloid which had made similar predictions about the bodybuilder's future health.

A:
German court
****