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On WTC #7, yes, no plane hit it. Briefly what the cause and effect were. When the North Tower came down, debris struck #7 and caused fires within the North side of the building. The water mains in the streets in the surrounding area were severely damaged by Towers #1 and #2 falling, so New York Fire Department could not fight #7s fire, plus they were overwhelmed with rescue efforts from Towers 1 and 2. From eye witnesses, and thermal photos taken, structural engineers determined, that columns #79 and #80 in WTC #7 were heated and failed, of which brought the building down. Understand, that #7 was uniquely designed and build over a large existing electrical substation, using cantilevered type of construction.
Barack Obama's Constitutional questions, and 911 were total and separate issues. 911 have been long resolved, while Obama's are current, pending, and unresolved.