About tens of thousands of years ago, people lived in America.

In the past, most anthropologists believed that the first Americans crossed the Bering Strait from northern Siberia to Alaska, and their time would not be earlier than 5,000 years ago. They think that only after human beings invented long-distance ships can they reach America. This belief is so ingrained that when 1929 unearthed a human skull fossil near Made, California, although it belonged to an older geological layer, the people in the San Diego Museum of California shelved it, and 40 years passed in a flash.

In fact, as early as the spring of 1926, George Mckekin, a black cowherd, found a giant paleontological bristle skeleton that had disappeared as early as 1000 years ago in a dry river in Forsand, New Mexico. Archaeologists found a beautifully made spear fork stone tip in this skeleton; Then, in 1932, near Clovis, New Mexico, spear-fork stone tips were also found in the remains of mammoths, which were extinct about 12000 years ago. The scraper made of reindeer tibia found in yukon river, northwestern North America, has been confirmed to be 27,000 years old. New archaeological discoveries have promoted the development of American history. The above-mentioned Ma De skull fossil was removed from the shelf of the museum, and its history was determined to be 48,000 years.

Archaeological findings combined with geological and historical research confirmed that people who first came to the New World did not need to use ships, but walked. During the ancient ice age, glaciers expanded and the sea level dropped by hundreds of feet, making the Bering Strait between Siberia and Alaska once a continental bridge. At that time, the vast ice sheet was still a vibrant tundra landscape in the short summer. Large groups of herbivores migrated here, and ancient hunters followed them across the continental bridge, becoming the first immigrants in America. Land bridges appear and disappear alternately in geological history, and comprehensive textual research is needed to judge the initial migration time. At present, most archaeologists believe that at least 50 thousand years ago.

At first, Americans lived a hunting life. At first, hunting tools may be wooden spears, one end of which is sharpened or embedded with bone tips and stone tips. Later, they threw spears with faster speed. When the early Indians moved south to central North America, the tools they used in the cold desert of the Arctic were no longer suitable for the new environment. There are many giant animals living in temperate forests, such as mammoths, mastodons, manes, tapirs and so on. So new hunting and slaughtering tools began to appear. By about1.20 thousand years ago, the hunting behavior of early Americans had developed very maturely. The iconic Ke rovis stone tip is 3~5 inches long and extremely sharp. The most unique thing is that the surface of the blade is chiseled with longitudinal grooves, which are slightly similar to modern bayonets and can even penetrate the thick skin of behemoths. Rovis stone tip is an original creation of early Americans, which has not been found in other parts of the world.

About 10,000 years ago, the giant animals gradually disappeared, and the stone tip in rovis was replaced by a convenient spear gun, which was suitable for hunting smaller animals. At this time, edible plants such as berries, seeds and roots played an increasingly important role in the food of early Indians. About 7,000 years ago, gourds, avocados and pumpkins were planted in the highlands of Mexico. Indians also planted many cash crops and vegetable varieties on all continents today, making great contributions to the development of world agriculture.

When the land bridge connecting America and Asia disappeared for the last time, the connection between them seemed to be broken. However, before Columbus came to the New World, the development of ancient American culture had certain cultural homology with parts of Asia. For example, ancient Indians invented a game of dice, and its rules were very complicated, but Mexican Indians also played similar games; Indians in British Columbia and Alaska in Canada are also very similar to Maori in New Zealand in sailboats, tents and totem poles, and it is difficult to explain with the word "coincidence".

Historians believe that after entering the history of human civilization, the contact between Asians across the Pacific Ocean and American Indians must have happened several times. Of course, this contact is sporadic, and its impact on the development of Indian culture is limited.