Which of these led to the political change known as the reagan revolution? increasing disillusionment with government regulation
deep cuts in defense spending and social welfare programs
a steady increase in taxes paid by corporations and the wealthy
a decline in average longevity and an increase in infant mortality

i think it is a system for harvesting crops more easily

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

hope this !