By inference, the two sentences in this excerpt from Jack London's “The human drift” that express the main argument of the excerpt is: "
1) The history of civilization is a history of wandering, sword in hand, in search of food."
What is main argument?
The main argument of a text is that which is related to the Thesis or central idea.
The second relevant sentence is:
"Dominated by fear, and by their very fear accelerating their development, these early ancestors of ours, suffering hunger-pangs very like the ones we experience to-day, drifted on, hunting and being hunted, eating and being eaten, wandering through thousand-year-long odysseys of screaming primordial savagery, until they left their skeletons in glacial gravels, some of them, and their bone-scratching's in cave-men's lairs;"
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