President Washington was invited to dedicate the laying of the cornerstone. Masons did not build the monument, own it, or have any other part in the project.
That is not true. A Mason, Robert Mills, designed it -From wikipedia:
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Washington Monument
For American Freemasons, one such example is their involvement with the building as well as the current refurbishing of the U.S. Washington Monument (not to be confused with the
George Washington Masonic National Memorial).
Authorized by Congress in 1833, construction was not begun until 1848. Architect Robert Mills (a Mason) was hired by the privately funded Washington National Monument Society to design a great column with a colonnade at its base. It was intended that the colonnade would have heroic statues of Washington and other revolutionary heroes and founding fathers. Financial considerations forced the abandonment of the colonnade and statues.
On July 4, 1848, in an impressive ceremony attended by virtually every government official, M.W. Benjamin B. French, Grand Master, Grand Lodge of the District of Columbia, laid the cornerstone of this famous monument in a Masonic ceremony. The Washington National Monument Society, in charge of fund raising of the Monument, sensed the importance of Washington's Masonic membership and the great pride that masons felt across the country for their brother, Washington, the father of the country. The Society in 1851 and 1853 solicited members of the Masonic Order nationally through the Grand Lodges, to make contributions to the construction of the monument and some 250 Masonic Lodges contributed to the building of the Monument which contains 22 Masonic memorial stones contributed by 14 Grand Lodges and 8 individual Lodges. In addition, many other Masonic Orders including the Scottish Rite, Royal Arch, and Knights Templar contributed to the construction of the Monument.
The first Masonic stone ascending the Monument is that of the Grand Lodge of the District of Columbia at the 50 foot landing. This earliest Masonic contribution was no doubt tied into the cornerstone laying ceremony where the Grand Lodge of D.C. presided. The United States National Park Service has a very extensive and interesting section of the Memorial's
web site specifically devoted to the Masons' contributions and which shows
all of the stones contributed by Masons.
By 1854, the Washington National Monument Society had exhausted its funds and all work stopped at the 150 foot level. Turmoil within the Society, bad economic times, and the fury of the coming Civil War and its aftermath would halt monument construction for 22 years. There is still a discernible line between courses of differing stonework indicating the resumption of Monument construction funded now by Congress on August 2, 1876, and spurred on by the centennial celebration of the Declaration of Independence.
Whether or not Society Secretary John Carrol Brent was moved by the letter from the Lodge in Roxbury, Massachusetts, he began to again send solicitations to Masonic bodies and other fraternal orders. Between July and September 1874 over two hundred pledges were received by the Society from every part of the country, chiefly from the Masons, Odd Fellows, Knights of Pythias, Red Men, and other fraternal bodies. On April 15, 1875, 211 Masonic lodges across the country responded to Brent's call including four Grand Lodges (Florida, Illinois, Massachusetts and Ohio, the last three giving $1000 each). The average lodge gave between 10 and 50 dollars. Mithras Lodges of Perfection, A.A.S.R, Washington D.C. made a contribution as did 24 Royal Arch Chapters and 5 Commandaries.
Today, Masons are again involved in supporting the Washington Memorial with DC Masons having contributed in excess of $40,000 towards its renovation. It's just one more example of Masons honoring their country.
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