All you need is one building and that will be the biggest building in America. In 2011, the biggest building in America is the Willis Tower. When World Trade Centre number 1 is completed in 2013 that will be the biggest building in America including the spiral.
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It is unlikely that a sand storm could blow down a well-built, sturdy building. However, a severe sand storm could potentially cause damage to the exterior of a building or weaken its structure over time if it is not properly maintained.
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Cape Horn is at the bottom tip of South America. So you could go through the Strait of Magellan between South America and Tierra del Fuego This is an extremely dangerous waterway for ships. To avoid going around South America, ships can navigate through the Panama Canal in Central America.
Since the earth is a sphere (a ball), you can reach anywhere by going either direction from anywhere. But the trip is usually shorter in one direction than in the other. From the Prime Meridian, the trip to North America or South America is shorter if you head out going toward the west.
Man built the dam by first conducting surveys to find the best location, then creating a design and plan for construction. Construction involved excavating the site, building a foundation, and then erecting the structure using concrete or other materials. It required skilled labor, machinery, and coordination to successfully complete the project.