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If the workers achieve a compact and solid front to face any mistakes and negative factors , then the struggle will be won even before it starts . Although fossils of the stegomastodon ( a primitive relative of today 's elephant ) have been discovered just west of the reservoir , the area was not named for its former and formidable inhabitants , the name " Elephant Butte " was derived from the eroded core of an ancient volcano , now an island in the reservoir , in the shape of an elephant . But that expense , however large , was fully supported by an ample fortune wisely administered , and in the management of which the interests of the tenant were always considered as well as those of the landlord . For the last 150 million years or so , the eastern half of North America has been geologically quiet . Patterns of imigration in the United States have changed significantly over the past 20 years .