The american industrial revolution did much to the united states become a world power. however, it did cause a number of problems, two of which were: too many people traveled to america for work factory workers faced unsafe conditions big business monopolies and trusts formed congress regulated the business sector too harshly

the andes or andean mountains (spanish: cordillera de los andes) are the longest continental mountain range in the world, forming a continuous highland along the western edge of south america. this range is about 7,000 km (4,300 mi) long, about 200 to 700 km (120 to 430 mi) wide (widest between 18° south and 20° south latitude), and of an average height of about 4,000 m (13,000 ft). the andes extend from north to south through seven south american countries: venezuela, colombia, ecuador, peru, bolivia, chile and argentina.

from wikipedia

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d. migration