Answer:
Europe has had the most wars in human history. All the wars in europe have been started either by, Denmark, Germany, or Sweden.
Witnesses?
Your question doesn't really have all the information necessary to have an accurate answer.
Culture. Food, behavior.
History. Common past.
Religion. Majority of shared faith.
Nationality. Belief in common ancestry.
Territory. Boundaries, like Lake Michigan.
Language. Common dialect.
Nation-state. An independent geopolitical unit of people having a common culture and identity.
Article Two of the United States Constitution establishes the executive branch of the federal government, which carries out and enforces federal laws. The executive branch includes the President, the Vice President, the Cabinet, executive departments, independent agencies, and other boards, commissions, and committees.