The realistic details shown in european paintings of the 14th and 15th centuries were made possible by the use of:

Oil painting

Explanation:

The period between the years 1400 and 1500 is very famous in Europe for it's artistic activities in painting, sculpture and architecture. This period is known as "quattrocento" as it coincided with the Florence Renaissance. Oil paintings were introduced from Northern Europe and they quickly attracted a lot of artists. It enabled the discovery of new ways of handling light as well as the sfumato and chiaroscuro tecniques. Oil painting maked it easy to fuse tones, it also helped painters obtain satisfactory linear treatmeant and crisp effects.

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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answer-the island had airfields that the u.s. military needed.