Hoover Dam.

Hoover Dam is an important water conservancy project in the United States, located in the Black Canyon at the junction of Nevada and Arizona, across the Colorado River. Construction started in April 1931 and was completed in March 1936. Hoover Dam has become a famous tourist attraction, attracting a large number of tourists. Its unique aesthetic design and profound historical background make it an important symbol of American culture. The construction of the Hoover Dam not only reflected the engineering technology and innovation capabilities of the United States, but also witnessed the determination and wisdom of the U.S. government in the face of economic difficulties. As a great project in American history, the Hoover Dam still plays an important role in the economic and social development of the United States.