I am not sure but I think it would be chemicals because you can see evrything except chemicals
After a fierce debate in Congress, in November of 1939, a final Neutrality Act passed. This Act lifted the arms embargo and put all trade with belligerent nations under the terms of “cash-and-carry.” The ban on loans remained in effect, and American ships were barred from transporting goods to belligerent ports.
Basically- all individual freedoms are denied in a totalitarian state as such states wants to control all aspects of social life: so freedom of speech, freedom of political opinions would definitely be denied, and partially also other personal freedoms, such as right to marry the chosen person or have children.
Before the Neolithic, most human groups were hunter-gatherers this means to obtain food including fruits, plants, or meat from animals they hunted animals and collected resources moving from one area to another as they depended on the availability of animals and plants in each area. This made the availability of sources changing and unreliable.