In 1200 A.D., a group of nomadic hunters called the Aztecs migrated into Mesoamerica in search of food and wild game. By 1325 A.D., the Aztecs had settled in present day Mexico City, and had built a large, beautiful and powerful city on a small island which they called Tenochtitlan.
As the population of Tenochtitlan grew, the island became too small. Their innovative solution was to make the island bigger. They built large wooden rafts, which they covered with mud and secured to the lakebed with stakes. Many people lived and farmed on these floating parcels of land.
Everybody thinks of changing humanity and nobody thinks of changing himself.
Lewis & Clark stayed near present day Astoria, Oregon during the winter of 1805-06, and built Fort Clatsop for shelter.