what material was used to build it?
Marble, aluminum
Washington Monument
The building of the monument proceeded quickly after Congress had provided sufficient funding. In four years, it was completed, with the 100-ounce (2.83 kg) aluminum apex/lightning-rod being put in place on December 6, 1884. The apex was the largest single piece of aluminum cast at the time, when aluminum commanded a price comparable to silver. Two years later, the Hall–Héroult process made aluminum easier to produce and the price of aluminum plummeted, though it should have provided a lustrous, non-rusting apex. The monument opened to the public on October 9, 1888.
who was president when the washington monument was built UNANSWERABLE when was it built? Construction began in 1848. when did it get completed? 1888 who built it? Robert Mills was the architect. did he also design it? Yes, the society held a competition for designs, and he was the winner. who inaugurated it? Chester A. Arthur who was he? He was  an American attorney and politician who served as the 21st president of the United States from 1881 to 1885. where is the monument located? On the National Mall in Washington, D.C. which country? United States of America who was the monument named after? George Washington was he a president? Yes, he was the first president of the United States. who financed the construction of the monument? UNANSWERABLE was it damaged by any natural disaster? Yes, it  sustained damage during the 5.8 magnitude 2011 Virginia earthquake.
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Washington Monument [SEP] Resumption
Casey found 92 memorial stones ("presented stones") already inlaid into the interior walls of the first phase of construction. Before construction continued he temporarily removed eight stones at the 150-foot level so that the walls at that level could be sloped outward, producing thinner second-phase walls. He inserted those stones and most of the remaining memorial stones stored in the lapidarium into the interior walls during 1885–1889. The bottom third of the monument is a slightly lighter shade than the rest of the construction because the marble was obtained from different quarries. The building of the monument proceeded quickly after Congress had provided sufficient funding.