This question: From whence come wars, and fightings among you(James4:1-3)? It's rhetorical question - Apostle James, provides the answer.
The answer is simple, and hidden, in plain sight.
Repeat - these "wars, and rumors of wars" are civil wars. This is a "Sign" given by our LORD to the Apostles in training(Mat24:).The Descendants of Sarah (Abraham) are Concentrated in the West. They may not know their heritage, but Satan, and It's descendants know.
The answer to where these wars come from among you: is lust (pleasure). People are also greedy (covetous), and can Not be satisfied.
People are out of control, between their ears. "Yet have not, because - they ask not": they should humble themselves and ask the LORD. The other reason they "receive not, because they ask amiss" - selfish reasons!
The greedy warriors lack peace. Peace can Not be purchased or gained via war. We must learn to love, and respect, - ourselves.
Unless war is to directly protect ourselves, family, or neighborhood; war is a waste.