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The Initial Point of Boundary Between U.S. and Mexico, Monument No. 258, was first established as a cairn of rocks in 1849 following the signing of the Treaty of Guadalupe Hidalgo. A white marble shaft was manufactured in New York, transported around Cape Horn on the USS Supply to San Diego, and erected and dedicated at the site in Imperial Beach in June, 1851. The marble monument was an obelisk about in height, resting on a marble pedestal. On its top was an inverted acorn to symbolize the strength and stature of the California live oak tree.〔Raney, Morris H. International Boundary and Water Commission, U.S. Section. (Nomination form to the National Register of Historic Places ) (copied verbatim, allowed as per WP:PD, as the author is a federal employee acting in an official capacity)〕 In 1894 it was found that the initial monument had become so mutilated by visitors that its outlines were nearly destroyed, and its inscriptions partly obliterated. The Barlow-Blanco Commission had the monument renovated in San Diego, reconstructed at the site, and protected with an enclosure in 1894. Excepting for normal wear and tear and some slight vandalism, as of 1974 the marble monument as reconstructed in 1894 still stood at its original site.〔 The significance of the monument is stated in the inscription on the west side of the original marble shaft:〔
The monument is the westernmost boundary marker on the international boundary between the United States and Mexico and as such has since its erection and will throughout the future mark the southwestern corner of the Continental United States.〔 Pursuant to President Richard Nixon's "Legacy of Parks", Mrs. Pat Nixon in August 1971 turned over of surplus Navy land, formerly known as Border Field, to the people of California as a beach park. The area is now known as Border Field State Park.〔 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Initial Point of Boundary Between U.S. and Mexico」の詳細全文を読む スポンサード リンク
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