History was a driving force behind such migration, since humans tended to move to new territory when they lacked food, shelter, or other resources--meaning that most of the conflicts throughout history have been driven by the same forces that drove migration out of Africa.
I would say all of the above.
Money was accepted every where.
P.S. you should prob study ur work before you do this problem set again. This is the 3rd question u've asked
If countries don't buy as much land from other countries, there won't be as much disagreement over who should own what land. Countries could share the land to help prevent the war. When countries form alliances, more people will get involved in the war. Other countries that don't have alliances are angry at the countries that do.
D) issues important to the population that people want addressed by the government
Issues that are noticed by the political community as deserving public attention and governmental action
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