Sentence:  By the first year of the Common Era (2,000 years ago) the globe was filled with humans living in one of five conditions depicted in FIGURE 41: (1) complex stratified <WSD>agriculturalism</WSD>, (2) simple peasant <WSD>agriculturalism</WSD>, (3) nomadic pastoralism, (4) general HFG, and (5) specialized HFG. 
Meaning of the word marked with <WSD> tags:  The practice of agriculture; agriculturism.