Answer :
Final answer:
The Colorado River is considered the lifeline for the Southwest region because of the significant role the Hoover Dam played in controlling floods and droughts, generating hydroelectric power, and irrigating extensive agricultural land.
Explanation:
The Colorado River is considered the lifeline for the Southwest due to its role in irrigating agriculture and providing hydroelectric power. Constructed in the Black Canyon, the Hoover Dam played a significant role in domesticating the Colorado River. Completed in 1935, it served to control frequent floods and droughts by diverting the river and generating hydroelectric power.Furthermore, the dam's resulting reservoir, Lake Mead, allowed for the irrigation of two million acres of land. This contributed significantly to the social, political, and economic development of the Southwest, thereby earning the Colorado River its status as the region's lifeline.
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