When was the Capitol Building built?
It was built over a period of over 200 years, which may be why you are confused–there’s no one date. The first portion of the building began construction in the 1790s, but was burnt by the British during the War of 1812. There was major construction in the 1850s, with the current dome added in the 1860s. The building was added to pretty continuously over the past 100 years. The newest part of the building, a visitor center and expansion of office spaces, just opened a couple of months ago. So, the answer to your question is that construction began in the 1790s, with the building almost continually expanded and improved in the following years, with the most recent addition completed in 2008. This wikipedia article should help you to understand: http://en.wikipedia.org/wiki/United_Stat…
