Put these events in order: war of 1812, louisiana purchase, embargo act, monroe doctrine, xyz affair

A boundary is a line surrounding a territory that is controlled by a person or group in power. Boundaries can be visible or imaginary. There are two types of boundaries: physical and political. A physical boundary is created by natural or physical features. For example, the Himalayas create a natural boundary between India and Tibet. A political boundary is one that is formed between groups of people for political reasons, e.g. conflicts or peaceful agreements between neighboring groups.