What characteristic was significant for the growth of agriculture among native Americans?

The significant characteristic for the growth of agriculture among Native Americans was the presence of long growing seasons. This aspect was crucial because it allowed for the cultivation of a variety of crops throughout the year, supporting food production and the sustenance of communities. A longer growing season provides the opportunity for multiple harvests and the ability to grow a diverse range of plants, which is essential for agricultural development.

In contrast, while large deer populations might have supported hunting practices, they do not directly contribute to agricultural growth. The presence of gold and silver is indicative of mineral wealth but does not relate to farming and crop cultivation. Access to cotton plants, although important, was not a primary characteristic for the broader agricultural practices of many Native American societies, especially before European contact; they cultivated a variety of other crops that were more significant for their survival and cultural practices. Therefore, long growing seasons stood out as the key factor that facilitated and expanded agricultural development among Native American populations.