>а именно откат до луков, копий

>Major pre-Columbian earthworks have been discovered, including ceremonial sites, fortified settlements, mounded ring villages and agricultural and transport infrastructure.[12] Thanks to the development of remote sensing technology (and also due to deforestation), it has been possible to document the pre-Columbian period's extensive agricultural infrastructure.[1] These include tens of thousands of raised agricultural beds, as well as hundreds of kilometers of causeways, roads and canals; artificial cuts between river meander bends; artificial ponds and fish weirs.[1] In addition, many indigenous groups developed techniques for cultivating aquatic resources. They constructed raised fields and mounds in marshes and floodplains.[13] These were designed to withstand or manage seasonal flooding and provided a consistent source of crops such as water chestnuts and arrowroot.